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Section 13 - Ice Path and Blackthorn City Gym

Source: ../section-13-ice-path-and-blackthorn-city-gym.txt (the FAQ's own internal heading for this block is ---- 19 > Ice Path and Blackthorn City Gym ----)

Maps covered: MAP_ROUTE_44, MAP_ICE_PATH_1F, MAP_ICE_PATH_B1F, MAP_ICE_PATH_B2F_MAHOGANY_SIDE, MAP_ICE_PATH_B3F, MAP_ICE_PATH_B2F_BLACKTHORN_SIDE, MAP_BLACKTHORN_CITY, MAP_BLACKTHORN_POKECENTER_1F, MAP_BLACKTHORN_MART, MAP_BLACKTHORN_EMYS_HOUSE, MAP_MOVE_DELETERS_HOUSE, MAP_BLACKTHORN_DRAGON_SPEECH_HOUSE, MAP_BLACKTHORN_GYM_1F, MAP_BLACKTHORN_GYM_2F, MAP_DRAGONS_DEN_1F, MAP_DRAGONS_DEN_B1F

Badges / key milestones in this section:

  • EVENT_GOT_HM07_WATERFALL (HM07 on MAP_ICE_PATH_1F)
  • EVENT_BEAT_CLAIR (the battle is won, but no badge yet)
  • EVENT_DRAGONS_DEN_B1F_DRAGON_FANG -> ENGINE_RISINGBADGE + EVENT_GOT_TM24_DRAGONBREATH
  • specialphonecall SPECIALCALL_MASTERBALL queued (Elm's Master Ball call, redeemed next section)

1. Route order

# Map constant asm file Enter via Leaves via Why (walkthrough beat)
0 MAP_MAHOGANY_TOWN (previous section) Fly east map connection "fly back to Mahogany Town, heal, head east onto Route 44"
1 MAP_ROUTE_44 maps/Route44.asm west connection from MAHOGANY_TOWN warp 1 at (56, 7) six trainers, Burnt Berry tree, two item balls
2 MAP_ICE_PATH_1F maps/IcePath1F.asm warp 1 (4, 19) from Route 44 warp 3 (37, 5) first ice maze, HM07 Waterfall
3 MAP_ICE_PATH_B1F maps/IcePathB1F.asm warp 1 (3, 15) warp 2 (17, 3) Strength boulder-into-hole puzzle
4 MAP_ICE_PATH_B2F_MAHOGANY_SIDE maps/IcePathB2FMahoganySide.asm warp 1 (17, 1), or drop through holes warp 2 (9, 11) Full Heal, Max Potion, hidden Carbos
5 MAP_ICE_PATH_B3F maps/IcePathB3F.asm warp 1 (3, 5) warp 2 (15, 5) Rock Smash the rock, Nevermeltice
6 MAP_ICE_PATH_B2F_BLACKTHORN_SIDE maps/IcePathB2FBlackthornSide.asm warp 2 (3, 3) warp 1 (3, 15) TM44 Rest, hidden Ice Heal
7 MAP_ICE_PATH_B1F (south region) maps/IcePathB1F.asm warp 8 (11, 27) warp 7 (5, 25) Iron at (5, 35), hidden Max Potion
8 MAP_ICE_PATH_1F (south region) maps/IcePath1F.asm warp 4 (37, 13) warp 2 (36, 27) PP Up at (32, 23), then out
9 MAP_BLACKTHORN_CITY maps/BlackthornCity.asm warp 7 (36, 9) see below heal, restock, Move Deleter, Emy's trade
10 MAP_BLACKTHORN_POKECENTER_1F maps/BlackthornPokecenter1F.asm city warp 5 (21, 29) warp 1/2 heal
11 MAP_BLACKTHORN_MART maps/BlackthornMart.asm city warp 4 (15, 29) warp 1/2 restock Ultra Balls
12 MAP_BLACKTHORN_EMYS_HOUSE maps/BlackthornEmysHouse.asm city warp 3 (29, 23) warp 1/2 Dragonair <-> Rhydon trade ("northeast house")
13 MAP_MOVE_DELETERS_HOUSE maps/MoveDeletersHouse.asm city warp 6 (9, 31) warp 1/2 delete HM moves ("house in the south")
14 MAP_BLACKTHORN_GYM_1F maps/BlackthornGym1F.asm city warp 1 (18, 11) warp 1/2 (4/5, 17) Paul, Mike, Lola, Clair
15 MAP_BLACKTHORN_GYM_2F maps/BlackthornGym2F.asm 1F warp 3 (1, 7) / warp 4 (7, 9) holes and stairs Cody, Fran, six-boulder puzzle
16 MAP_DRAGONS_DEN_1F maps/DragonsDen1F.asm city warp 8 (20, 1) warp 3 (5, 15) corridor + internal ladder pair
17 MAP_DRAGONS_DEN_B1F maps/DragonsDenB1F.asm warp 1 (20, 3) same warp Surf + Whirlpool to the Dragon Fang at (35, 16); Clair hands over ENGINE_RISINGBADGE

Not covered here (next section): the walkthrough's last paragraph sends the player back to MAP_ELMS_LAB for the Master Ball (ElmGiveMasterBallScript, maps/ElmsLab.asm) and on toward the Pokemon League. The video-link header also names Dark Cave, but the prose never enters MAP_DARK_CAVE_BLACKTHORN_ENTRANCE.

MAP_BLACKTHORN_DRAGON_SPEECH_HOUSE (city warp 2, (13, 21)) is on the map but the walkthrough never enters it; it is documented below for completeness.

2. Maps

MAP_ROUTE_44

  • Script: maps/Route44.asm (Route44_MapEvents = 4d:4dd9 in pokegold.sym)
  • Blocks: maps/Route44.blk
  • Header: data/maps/maps.asm:73 -> TILESET_JOHTO, ROUTE, LANDMARK_ROUTE_44, MUSIC_LAKE_OF_RAGE, phone FALSE, PALETTE_AUTO, FISHGROUP_REMORAID
  • Dimensions: constants/map_constants.asm:61 -> map_const ROUTE_44, 30, 9 (so x in 0..59, y in 0..17)
  • Connections: data/maps/attributes.asm:239 -> west MAHOGANY_TOWN (offset 0), east BLACKTHORN_CITY (offset -9)
  • Scene scripts: none (def_scene_scripts empty). Callbacks: none.

Warps (def_warp_events)

idx x y destination map dest warp
1 56 7 ICE_PATH_1F 1

Coord events (def_coord_events)

None.

BG events (def_bg_events)

x y type script/item
53 7 BGEVENT_READ Route44Sign1 ("ROUTE 44 / ICE PATH AHEAD")
6 10 BGEVENT_READ Route44Sign2 ("MAHOGANY TOWN - BLACKTHORN CITY")
32 9 BGEVENT_ITEM Route44HiddenElixer -> hiddenitem ELIXER, EVENT_ROUTE_44_HIDDEN_ELIXER

Object events (def_object_events)

const sprite x y movement type sight script label event flag
ROUTE44_FISHER1 SPRITE_FISHER 42 5 STANDING_LEFT OBJECTTYPE_TRAINER 1 TrainerFisherWilton1 -1
ROUTE44_FISHER2 SPRITE_FISHER 19 13 STANDING_RIGHT OBJECTTYPE_TRAINER 1 TrainerFisherEdgar -1
ROUTE44_YOUNGSTER1 SPRITE_YOUNGSTER 10 9 SPINCLOCKWISE OBJECTTYPE_TRAINER 3 TrainerPsychicPhil -1
ROUTE44_SUPER_NERD SPRITE_SUPER_NERD 35 2 STANDING_LEFT OBJECTTYPE_TRAINER 5 TrainerPokemaniacZach -1
ROUTE44_YOUNGSTER2 SPRITE_YOUNGSTER 50 7 STANDING_LEFT OBJECTTYPE_TRAINER 3 TrainerBirdKeeperVance1 -1
ROUTE44_COOLTRAINER_M SPRITE_COOLTRAINER_M 41 15 STANDING_LEFT OBJECTTYPE_TRAINER 5 TrainerCooltrainermAllen -1
ROUTE44_COOLTRAINER_F SPRITE_COOLTRAINER_F 31 14 STANDING_LEFT OBJECTTYPE_TRAINER 5 TrainerCooltrainerfCybil -1
ROUTE44_FRUIT_TREE SPRITE_FRUIT_TREE 9 5 STILL OBJECTTYPE_SCRIPT 0 Route44FruitTree -1
ROUTE44_POKE_BALL1 SPRITE_POKE_BALL 30 8 STILL OBJECTTYPE_ITEMBALL 0 Route44MaxRevive EVENT_ROUTE_44_MAX_REVIVE
ROUTE44_POKE_BALL2 SPRITE_POKE_BALL 43 2 STILL OBJECTTYPE_ITEMBALL 0 Route44UltraBall EVENT_ROUTE_44_ULTRA_BALL

Scripts of interest

  • TrainerBirdKeeperVance1 / .Script - after the fight this is the phone-number script. checkevent EVENT_VANCE_READY_FOR_REMATCH -> rematch branch; checkcellnum PHONE_BIRDKEEPER_VANCE -> already registered; otherwise sets EVENT_VANCE_ASKED_FOR_PHONE_NUMBER and runs askforphonenumber PHONE_BIRDKEEPER_VANCE. The rematch branch picks VANCE2 if EVENT_BEAT_ELITE_FOUR and VANCE3 if EVENT_RESTORED_POWER_TO_KANTO, and clears EVENT_VANCE_READY_FOR_REMATCH.
  • TrainerFisherWilton1 / .Script - same shape with PHONE_FISHER_WILTON, EVENT_WILTON_ASKED_FOR_PHONE_NUMBER, EVENT_WILTON_READY_FOR_REMATCH, and WILTON2 / WILTON3 for the later fights. FisherWiltonHugePoliwagText is the "you made me lose a POLIWAG" line the walkthrough quotes.
  • Route44FruitTree -> fruittree FRUITTREE_ROUTE_44. FRUITTREE_ROUTE_44 is index 10 (constants/script_constants.asm:222) and data/items/fruit_trees.asm:19 gives BURNT_BERRY.
  • Route44MaxRevive -> itemball MAX_REVIVE, Route44UltraBall -> itemball ULTRA_BALL.
  • The four one-line trainers (TrainerPsychicPhil, TrainerFisherEdgar, TrainerCooltrainerfCybil, TrainerPokemaniacZach, TrainerCooltrainermAllen) are endifjustbattled / opentext / writetext ... / waitbutton / closetext / end with no flag side effects beyond the trainer macro's own beaten flag.

Flags and events

constant defined in read/written by meaning for a bot
EVENT_BEAT_BIRD_KEEPER_VANCE constants/event_flags.asm trainer macro row in TrainerBirdKeeperVance1 set once Vance is beaten
EVENT_BEAT_PSYCHIC_PHIL same TrainerPsychicPhil "
EVENT_BEAT_FISHER_WILTON same TrainerFisherWilton1 "
EVENT_BEAT_FISHER_EDGAR same TrainerFisherEdgar "
EVENT_BEAT_COOLTRAINERF_CYBIL same TrainerCooltrainerfCybil "
EVENT_BEAT_POKEMANIAC_ZACH same TrainerPokemaniacZach "
EVENT_BEAT_COOLTRAINERM_ALLEN same TrainerCooltrainermAllen "
EVENT_ROUTE_44_MAX_REVIVE constants/event_flags.asm:1111 itemball object set -> ball gone
EVENT_ROUTE_44_ULTRA_BALL constants/event_flags.asm:1112 itemball object set -> ball gone
EVENT_ROUTE_44_HIDDEN_ELIXER constants/event_flags.asm:184 hiddenitem bg event one-shot hidden item
EVENT_VANCE_ASKED_FOR_PHONE_NUMBER / EVENT_WILTON_ASKED_FOR_PHONE_NUMBER constants/event_flags.asm trainer scripts second-ask dialogue branch
EVENT_VANCE_READY_FOR_REMATCH / EVENT_WILTON_READY_FOR_REMATCH same phone system rematch pending

Items

item how obtained source (label / bg_event / hidden) one-time flag
BURNT_BERRY headbutt-free fruit tree at (9, 5) Route44FruitTree / FRUITTREE_ROUTE_44 daily, not an event flag
MAX_REVIVE item ball at (30, 8) Route44MaxRevive EVENT_ROUTE_44_MAX_REVIVE
ULTRA_BALL item ball at (43, 2) Route44UltraBall EVENT_ROUTE_44_ULTRA_BALL
ELIXER hidden, bg_event (32, 9) Route44HiddenElixer EVENT_ROUTE_44_HIDDEN_ELIXER

Trainers

Party data all from data/trainers/parties.asm; classes from constants/trainer_constants.asm.

const class id party script label rematch/phone
PSYCHIC_T, PHIL PsychicGroup PSYCHIC_T (8) L24 NATU (Leer / Night Shade / Future Sight / Confuse Ray), L26 KADABRA (Disable / Psybeam / Recover / Future Sight); TRAINERTYPE_MOVES TrainerPsychicPhil none
FISHER, EDGAR FisherGroup FISHER (11) L25 REMORAID x2 (Lock-On / Psybeam / Aurora Beam / Bubblebeam); TRAINERTYPE_MOVES TrainerFisherEdgar none
COOLTRAINERF, CYBIL CooltrainerFGroup COOLTRAINERF (16) L25 BUTTERFREE (Confusion / Sleep Powder / Whirlwind / Gust), L25 BELLOSSOM (Absorb / Stun Spore / Acid / SolarBeam); TRAINERTYPE_MOVES TrainerCooltrainerfCybil none
COOLTRAINERM, ALLEN CooltrainerMGroup COOLTRAINERM (19) L27 CHARMELEON (Ember / Smokescreen / Rage / Scary Face); TRAINERTYPE_MOVES TrainerCooltrainermAllen none
POKEMANIAC, ZACH PokemaniacGroup POKEMANIAC (13) L27 RHYHORN; TRAINERTYPE_NORMAL TrainerPokemaniacZach none
FISHER, WILTON1 FisherGroup FISHER (10) L23 GOLDEEN, L23 GOLDEEN, L25 SEAKING; TRAINERTYPE_NORMAL TrainerFisherWilton1 PHONE_FISHER_WILTON; WILTON2/WILTON3 post-game
BIRD_KEEPER, VANCE1 BirdKeeperGroup BIRD_KEEPER (7) L25 PIDGEOTTO x2; TRAINERTYPE_NORMAL TrainerBirdKeeperVance1 PHONE_BIRDKEEPER_VANCE; VANCE2/VANCE3 post-game

Wild encounters

  • Grass, data/wild/johto_grass.asm:2208 def_grass_wildmons ROUTE_44, rates 10/10/10 percent, and morn == day == nite: L23 TANGELA, L22 WEEPINBELL, L22 BELLSPROUT, L24 LICKITUNG, L24 WEEPINBELL, L26 LICKITUNG, L26 LICKITUNG.
  • Water, data/wild/johto_water.asm:197 def_water_wildmons ROUTE_44, 2 percent: L25 POLIWAG, L20 POLIWAG, L25 POLIWHIRL. This is the Poliwag the walkthrough's "Pokemon on Route 44" list means; it is Surf-only, not grass.
  • Fishing group FISHGROUP_REMORAID (data/maps/maps.asm:73), data/wild/fish.asm:195 .Remoraid_Old/.Remoraid_Good/.Remoraid_Super: Old = Magikarp/Magikarp/Poliwag L10; Good = Magikarp L20, Poliwag L20 x2, time_group 6 (Poliwag L20); Super = Poliwag L40, time_group 7 (Poliwag L40), Magikarp L40, REMORAID L40.

MAP_ICE_PATH_1F

  • Script: maps/IcePath1F.asm (IcePath1F_MapEvents = 46:613f)
  • Blocks: maps/IcePath1F.blk
  • Header: data/maps/maps.asm:131 -> TILESET_ICE_PATH, CAVE, LANDMARK_ICE_PATH, MUSIC_DARK_CAVE, phone TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:118 -> map_const ICE_PATH_1F, 20, 18
  • Attributes: data/maps/attributes.asm:450, no connections
  • Scene scripts and callbacks: both empty

Warps (def_warp_events)

idx x y destination map dest warp
1 4 19 ROUTE_44 1
2 36 27 BLACKTHORN_CITY 7
3 37 5 ICE_PATH_B1F 1
4 37 13 ICE_PATH_B1F 7

Coord events / BG events

None.

Object events

const sprite x y movement type script label event flag
ICEPATH1F_POKE_BALL1 SPRITE_POKE_BALL 31 7 STILL OBJECTTYPE_ITEMBALL IcePath1FHMWaterfall EVENT_GOT_HM07_WATERFALL
ICEPATH1F_POKE_BALL2 SPRITE_POKE_BALL 32 23 STILL OBJECTTYPE_ITEMBALL IcePath1FPPUp EVENT_ICE_PATH_1F_PP_UP

Scripts of interest

  • IcePath1FHMWaterfall -> itemball HM_WATERFALL. Nothing gates it beyond reaching the tile; the badge check that makes the move usable is separate (see section 3).
  • IcePath1FPPUp -> itemball PP_UP. This ball is in the southern region of 1F, reached on the way back up from B1F warp 7, not on the way in.

Items

item how obtained source one-time flag
HM_WATERFALL (HM07) item ball at (31, 7) IcePath1FHMWaterfall EVENT_GOT_HM07_WATERFALL (constants/event_flags.asm:1065)
PP_UP item ball at (32, 23) IcePath1FPPUp EVENT_ICE_PATH_1F_PP_UP (:1066)

Wild encounters

data/wild/johto_grass.asm:798 def_grass_wildmons ICE_PATH_1F, rates 2/2/2 percent. Gold build (IF DEF(_GOLD)):

slot morn day nite
1 L21 SWINUB L21 SWINUB L21 SWINUB
2 L22 GOLBAT L22 GOLBAT L22 GOLBAT
3 L22 ZUBAT L22 ZUBAT L22 ZUBAT
4 L23 SWINUB L23 SWINUB L23 SWINUB
5 L22 ZUBAT L22 JYNX L22 ZUBAT
6 L22 JYNX L20 JYNX L22 JYNX
7 L22 JYNX L20 JYNX L22 JYNX

Silver (ELIF DEF(_SILVER)) replaces slot 3 with L22 DELIBIRD in all three time bands - that is the "Delibird (Silver only)" line in the walkthrough, and it is a slot swap, not an extra entry.

MAP_ICE_PATH_B1F

  • Script: maps/IcePathB1F.asm (IcePathB1F_MapEvents = 46:61e7, IcePathB1FSetUpStoneTableCallback = 46:6178)
  • Blocks: maps/IcePathB1F.blk
  • Header: data/maps/maps.asm:132 -> TILESET_ICE_PATH, CAVE, LANDMARK_ICE_PATH, MUSIC_DARK_CAVE, TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:119 -> map_const ICE_PATH_B1F, 10, 18
  • Callbacks: callback MAPCALLBACK_CMDQUEUE, IcePathB1FSetUpStoneTableCallback

Warps (def_warp_events)

idx x y destination map dest warp note
1 3 15 ICE_PATH_1F 3 up to the north 1F region
2 17 3 ICE_PATH_B2F_MAHOGANY_SIDE 1 stairs down
3 11 2 ICE_PATH_B2F_MAHOGANY_SIDE 3 hole
4 4 7 ICE_PATH_B2F_MAHOGANY_SIDE 4 hole
5 5 12 ICE_PATH_B2F_MAHOGANY_SIDE 5 hole
6 12 13 ICE_PATH_B2F_MAHOGANY_SIDE 6 hole
7 5 25 ICE_PATH_1F 4 up to the south 1F region
8 11 27 ICE_PATH_B2F_BLACKTHORN_SIDE 1

Coord events

None.

BG events

x y type script/item
15 31 BGEVENT_ITEM IcePathB1FHiddenMaxPotion -> hiddenitem MAX_POTION, EVENT_ICE_PATH_B1F_HIDDEN_MAX_POTION

Object events

const sprite x y movement type script label event flag
ICEPATHB1F_BOULDER1 SPRITE_BOULDER 11 7 STRENGTH_BOULDER OBJECTTYPE_SCRIPT IcePathB1FBoulder EVENT_BOULDER_IN_ICE_PATH_1
ICEPATHB1F_BOULDER2 SPRITE_BOULDER 7 8 STRENGTH_BOULDER OBJECTTYPE_SCRIPT IcePathB1FBoulder EVENT_BOULDER_IN_ICE_PATH_2
ICEPATHB1F_BOULDER3 SPRITE_BOULDER 8 9 STRENGTH_BOULDER OBJECTTYPE_SCRIPT IcePathB1FBoulder EVENT_BOULDER_IN_ICE_PATH_3
ICEPATHB1F_BOULDER4 SPRITE_BOULDER 17 7 STRENGTH_BOULDER OBJECTTYPE_SCRIPT IcePathB1FBoulder EVENT_BOULDER_IN_ICE_PATH_4
ICEPATHB1F_POKE_BALL SPRITE_POKE_BALL 5 35 STILL OBJECTTYPE_ITEMBALL IcePathB1FIron EVENT_ICE_PATH_B1F_IRON

Scripts of interest

  • IcePathB1FSetUpStoneTableCallback writes a command queue with one cmdqueue CMDQUEUE_STONETABLE, .StoneTable entry. .StoneTable is the warp-id -> boulder-object -> script mapping:

    stonetable 3, ICEPATHB1F_BOULDER1, .Boulder1
stonetable 4, ICEPATHB1F_BOULDER2, .Boulder2
stonetable 5, ICEPATHB1F_BOULDER3, .Boulder3
stonetable 6, ICEPATHB1F_BOULDER4, .Boulder4
db -1

    So boulder N must be pushed onto warp N+2 - i.e. boulder 1 onto the hole at (11, 2), boulder 2 onto (4, 7), boulder 3 onto (5, 12), boulder 4 onto (12, 13).

  • Each .BoulderN arm does disappear ICEPATHB1F_BOULDERN (which sets EVENT_BOULDER_IN_ICE_PATH_N) and clearevent EVENT_BOULDER_IN_ICE_PATH_NA (which makes the twin boulder object on ICE_PATH_B2F_MAHOGANY_SIDE appear), then falls into .FinishBoulder: pause 30, scall .BoulderFallsThrough (playsound SFX_STRENGTH + earthquake 80), then IcePathBoulderFellThroughText ("The boulder fell / through.").

  • IcePathB1FBoulder -> jumpstd StrengthBoulderScript (the "may be able to push this with STRENGTH" prompt).

Flags and events

constant defined in read/written by meaning for a bot
EVENT_BOULDER_IN_ICE_PATH_1..4 constants/event_flags.asm:1195-1198 .BoulderN disappear set -> that B1F boulder is gone (fell)
EVENT_BOULDER_IN_ICE_PATH_1A..4A constants/event_flags.asm:1199-1202 .BoulderN clearevent; set at new game by the init list in engine/events/std_scripts.asm clear -> the fallen boulder is now visible on B2F Mahogany Side
EVENT_ICE_PATH_B1F_IRON :1067 itemball object
EVENT_ICE_PATH_B1F_HIDDEN_MAX_POTION :158 hidden bg event

Items

item how obtained source one-time flag
IRON item ball at (5, 35) IcePathB1FIron EVENT_ICE_PATH_B1F_IRON
MAX_POTION hidden at (15, 31) IcePathB1FHiddenMaxPotion EVENT_ICE_PATH_B1F_HIDDEN_MAX_POTION

Wild encounters

data/wild/johto_grass.asm:853 def_grass_wildmons ICE_PATH_B1F, 2/2/2 percent - byte-for-byte the same table as ICE_PATH_1F above (same levels, same Silver Delibird swap).

MAP_ICE_PATH_B2F_MAHOGANY_SIDE

  • Script: maps/IcePathB2FMahoganySide.asm (..._MapEvents = 46:6287)
  • Blocks: maps/IcePathB2FMahoganySide.blk
  • Header: data/maps/maps.asm:133 -> TILESET_ICE_PATH, CAVE, LANDMARK_ICE_PATH, MUSIC_DARK_CAVE, TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:120 -> map_const ICE_PATH_B2F_MAHOGANY_SIDE, 10, 9
  • Scene scripts and callbacks: both empty

Warps

idx x y destination map dest warp note
1 17 1 ICE_PATH_B1F 2 stairs back up
2 9 11 ICE_PATH_B3F 1 ladder down
3 11 4 ICE_PATH_B1F 3 landing under hole 1
4 4 6 ICE_PATH_B1F 4 landing under hole 2
5 4 12 ICE_PATH_B1F 5 landing under hole 3
6 12 12 ICE_PATH_B1F 6 landing under hole 4

Coord events

None.

BG events

x y type script/item
0 17 BGEVENT_ITEM IcePathB2FMahoganySideHiddenCarbos -> hiddenitem CARBOS, EVENT_ICE_PATH_B2F_MAHOGANY_SIDE_HIDDEN_CARBOS

Object events

const sprite x y movement type script label event flag
ICEPATHB2FMAHOGANYSIDE_BOULDER1 SPRITE_BOULDER 11 3 STILL OBJECTTYPE_SCRIPT IcePathB2FMahoganySideBoulder EVENT_BOULDER_IN_ICE_PATH_1A
ICEPATHB2FMAHOGANYSIDE_BOULDER2 SPRITE_BOULDER 4 7 STILL OBJECTTYPE_SCRIPT same EVENT_BOULDER_IN_ICE_PATH_2A
ICEPATHB2FMAHOGANYSIDE_BOULDER3 SPRITE_BOULDER 3 12 STILL OBJECTTYPE_SCRIPT same EVENT_BOULDER_IN_ICE_PATH_3A
ICEPATHB2FMAHOGANYSIDE_BOULDER4 SPRITE_BOULDER 12 13 STILL OBJECTTYPE_SCRIPT same EVENT_BOULDER_IN_ICE_PATH_4A
ICEPATHB2FMAHOGANYSIDE_POKE_BALL1 SPRITE_POKE_BALL 8 9 STILL OBJECTTYPE_ITEMBALL IcePathB2FMahoganySideFullHeal EVENT_ICE_PATH_B2F_MAHOGANY_SIDE_FULL_HEAL
ICEPATHB2FMAHOGANYSIDE_POKE_BALL2 SPRITE_POKE_BALL 0 2 STILL OBJECTTYPE_ITEMBALL IcePathB2FMahoganySideMaxPotion EVENT_ICE_PATH_B2F_MAHOGANY_SIDE_MAX_POTION

Scripts of interest

  • IcePathB2FMahoganySideBoulder -> jumptext IcePathB2FMahoganySideBoulderText ("It's immovably / imbedded in ice."). These boulders are SPRITEMOVEDATA_STILL, not STRENGTH_BOULDER - they are scenery once they land, and they are the reason the four B1F boulders are one-way.
  • IcePathB2FMahoganySideFullHeal -> itemball FULL_HEAL. This is the Full Heal the walkthrough says to grab after dropping through a hole.
  • IcePathB2FMahoganySideMaxPotion -> itemball MAX_POTION (the walkthrough's item list omits it).

Items

item how obtained source one-time flag
FULL_HEAL item ball at (8, 9) IcePathB2FMahoganySideFullHeal EVENT_ICE_PATH_B2F_MAHOGANY_SIDE_FULL_HEAL (:1068)
MAX_POTION item ball at (0, 2) IcePathB2FMahoganySideMaxPotion EVENT_ICE_PATH_B2F_MAHOGANY_SIDE_MAX_POTION (:1069)
CARBOS hidden at (0, 17) IcePathB2FMahoganySideHiddenCarbos EVENT_ICE_PATH_B2F_MAHOGANY_SIDE_HIDDEN_CARBOS (:159)

Wild encounters

data/wild/johto_grass.asm:908, 2/2/2 percent, one level higher than B1F: morn L22 SWINUB / L23 GOLBAT / L23 ZUBAT / L24 SWINUB / L23 ZUBAT / L23 JYNX / L23 JYNX; day swaps slots 5-7 to L23 JYNX / L21 JYNX / L21 JYNX; nite matches morn. Silver replaces slot 3 with DELIBIRD at the same level.

MAP_ICE_PATH_B3F

  • Script: maps/IcePathB3F.asm (IcePathB3F_MapEvents = 46:632e)
  • Blocks: maps/IcePathB3F.blk
  • Header: data/maps/maps.asm:135 -> TILESET_ICE_PATH, CAVE, LANDMARK_ICE_PATH, MUSIC_DARK_CAVE, TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:122 -> map_const ICE_PATH_B3F, 10, 9
  • Scene scripts and callbacks: both empty

Warps

idx x y destination map dest warp
1 3 5 ICE_PATH_B2F_MAHOGANY_SIDE 2
2 15 5 ICE_PATH_B2F_BLACKTHORN_SIDE 2

Coord events / BG events

None.

Object events

const sprite x y movement type script label event flag
ICEPATHB3F_POKE_BALL SPRITE_POKE_BALL 5 7 STILL OBJECTTYPE_ITEMBALL IcePathB3FNevermeltice EVENT_ICE_PATH_B3F_NEVERMELTICE
ICEPATHB3F_ROCK SPRITE_ROCK 6 6 SMASHABLE_ROCK OBJECTTYPE_SCRIPT IcePathB3FRock -1

Scripts of interest

  • IcePathB3FRock -> jumpstd SmashRockScript. The rock at (6, 6) sits between the ladder at (3, 5) and the Nevermeltice at (5, 7); no badge is required for ROCK SMASH, only the move in the party (HasRockSmash in engine/events/overworld.asm / AskRockSmashScript).
  • IcePathB3FNevermeltice -> itemball NEVERMELTICE.

Items

item how obtained source one-time flag
NEVERMELTICE item ball at (5, 7) IcePathB3FNevermeltice EVENT_ICE_PATH_B3F_NEVERMELTICE (:1071)

Wild encounters

data/wild/johto_grass.asm:1018, 2/2/2 percent, one level above B2F: morn/nite L23 SWINUB / L24 GOLBAT / L24 ZUBAT / L25 SWINUB / L24 ZUBAT / L24 JYNX / L24 JYNX; day swaps slots 5-7 to JYNX L24/L22/L22.

MAP_ICE_PATH_B2F_BLACKTHORN_SIDE

  • Script: maps/IcePathB2FBlackthornSide.asm (..._MapEvents = 46:6305)
  • Blocks: maps/IcePathB2FBlackthornSide.blk
  • Header: data/maps/maps.asm:134 -> TILESET_ICE_PATH, CAVE, LANDMARK_ICE_PATH, MUSIC_DARK_CAVE, TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:121 -> map_const ICE_PATH_B2F_BLACKTHORN_SIDE, 5, 9
  • Scene scripts and callbacks: both empty

Warps

idx x y destination map dest warp
1 3 15 ICE_PATH_B1F 8
2 3 3 ICE_PATH_B3F 2

Coord events

None.

BG events

x y type script/item
2 10 BGEVENT_ITEM IcePathB2FBlackthornSideHiddenIceHeal -> hiddenitem ICE_HEAL, EVENT_ICE_PATH_B2F_BLACKTHORN_SIDE_HIDDEN_ICE_HEAL

Object events

const sprite x y movement type script label event flag
ICEPATHB2FBLACKTHORNSIDE_POKE_BALL SPRITE_POKE_BALL 8 16 STILL OBJECTTYPE_ITEMBALL IcePathB2FBlackthornSideTMRest EVENT_ICE_PATH_B2F_BLACKTHORN_SIDE_TM_REST

Items

item how obtained source one-time flag
TM_REST (TM44) item ball at (8, 16) IcePathB2FBlackthornSideTMRest EVENT_ICE_PATH_B2F_BLACKTHORN_SIDE_TM_REST (:1070)
ICE_HEAL hidden at (2, 10) IcePathB2FBlackthornSideHiddenIceHeal EVENT_ICE_PATH_B2F_BLACKTHORN_SIDE_HIDDEN_ICE_HEAL (:160)

Wild encounters

data/wild/johto_grass.asm:963, identical to ICE_PATH_B2F_MAHOGANY_SIDE.

MAP_BLACKTHORN_CITY

  • Script: maps/BlackthornCity.asm (BlackthornCity_MapEvents = 49:5e4f, BlackthornCityFlypointCallback = 49:58f2)
  • Blocks: maps/BlackthornCity.blk
  • Header: data/maps/maps.asm:187 -> TILESET_JOHTO, TOWN, LANDMARK_BLACKTHORN_CITY, MUSIC_AZALEA_TOWN, phone FALSE, PALETTE_AUTO, FISHGROUP_POND
  • Dimensions: constants/map_constants.asm:172 -> map_const BLACKTHORN_CITY, 20, 18
  • Connections: data/maps/attributes.asm:160 -> south ROUTE_45 (offset 0), west ROUTE_44 (offset 9)
  • Callbacks:
    • MAPCALLBACK_NEWMAP, BlackthornCityFlypointCallback -> setflag ENGINE_FLYPOINT_BLACKTHORN
    • MAPCALLBACK_OBJECTS, BlackthornCitySantosCallback -> readvar VAR_WEEKDAY, appear/disappear BLACKTHORNCITY_SANTOS on SATURDAY

Warps

idx x y destination map dest warp
1 18 11 BLACKTHORN_GYM_1F 1
2 13 21 BLACKTHORN_DRAGON_SPEECH_HOUSE 1
3 29 23 BLACKTHORN_EMYS_HOUSE 1
4 15 29 BLACKTHORN_MART 2
5 21 29 BLACKTHORN_POKECENTER_1F 1
6 9 31 MOVE_DELETERS_HOUSE 1
7 36 9 ICE_PATH_1F 2
8 20 1 DRAGONS_DEN_1F 1

Coord events

None.

BG events

x y type script/item
34 24 BGEVENT_READ BlackthornCitySign
17 13 BGEVENT_READ BlackthornGymSign
7 31 BGEVENT_READ MoveDeletersHouseSign
21 3 BGEVENT_READ DragonDensSign
5 25 BGEVENT_READ BlackthornCityTrainerTips
16 29 BGEVENT_READ BlackthornCityMartSign -> jumpstd MartSignScript
22 29 BGEVENT_READ BlackthornCityPokecenterSign -> jumpstd PokecenterSignScript

Object events

const sprite x y movement type script label event flag
BLACKTHORNCITY_SUPER_NERD1 SPRITE_SUPER_NERD 18 12 STANDING_DOWN OBJECTTYPE_SCRIPT BlackthornSuperNerdScript EVENT_BLACKTHORN_CITY_SUPER_NERD_BLOCKS_GYM
BLACKTHORNCITY_SUPER_NERD2 SPRITE_SUPER_NERD 19 12 STANDING_DOWN OBJECTTYPE_SCRIPT BlackthornSuperNerdScript EVENT_BLACKTHORN_CITY_SUPER_NERD_DOES_NOT_BLOCK_GYM
BLACKTHORNCITY_GRAMPS1 SPRITE_GRAMPS 20 2 STANDING_DOWN OBJECTTYPE_SCRIPT BlackthornGramps1Script EVENT_BLACKTHORN_CITY_GRAMPS_BLOCKS_DRAGONS_DEN
BLACKTHORNCITY_GRAMPS2 SPRITE_GRAMPS 21 2 STANDING_LEFT OBJECTTYPE_SCRIPT BlackthornGramps2Script EVENT_BLACKTHORN_CITY_GRAMPS_NOT_BLOCKING_DRAGONS_DEN
BLACKTHORNCITY_BLACK_BELT SPRITE_BLACK_BELT 24 31 WALK_LEFT_RIGHT (radius 1) OBJECTTYPE_SCRIPT BlackthornBlackBeltScript -1
BLACKTHORNCITY_COOLTRAINER_F1 SPRITE_COOLTRAINER_F 9 25 WALK_LEFT_RIGHT (radius 2) OBJECTTYPE_SCRIPT BlackthornCooltrainerF1Script -1
BLACKTHORNCITY_YOUNGSTER1 SPRITE_YOUNGSTER 13 15 WALK_LEFT_RIGHT (radius 1) OBJECTTYPE_SCRIPT BlackthornYoungsterScript -1
BLACKTHORNCITY_SANTOS SPRITE_YOUNGSTER 22 20 STANDING_DOWN OBJECTTYPE_SCRIPT SantosScript EVENT_BLACKTHORN_CITY_SANTOS_OF_SATURDAY
BLACKTHORNCITY_COOLTRAINER_F2 SPRITE_COOLTRAINER_F 35 19 STANDING_UP OBJECTTYPE_SCRIPT BlackthornCooltrainerF2Script -1

Scripts of interest

  • BlackthornCityFlypointCallback - setflag ENGINE_FLYPOINT_BLACKTHORN (constants/engine_flags.asm:89). Fires on MAPCALLBACK_NEWMAP, i.e. the first time the player walks out of the Ice Path.
  • BlackthornSuperNerdScript - checkevent EVENT_BEAT_CLAIR -> Text_ClairIsBeaten; else checkevent EVENT_CLEARED_RADIO_TOWER -> Text_ClairIsIn; else Text_ClairIsOut ("Our GYM LEADER is training in the cave behind here"). Both nerd objects share this script.
  • BlackthornGramps1Script -> BlackthornGrampsRefusesEntryText ("Only dragon users are permitted to train here"). BlackthornGramps2Script -> BlackthornGrampsGrantsEntryText ("Since CLAIR ... has allowed it"). These are the Dragon's Den doorman, one object per state.
  • SantosScript - Saturday-only NPC, verbosegiveitem SPELL_TAG, guarded by EVENT_MET_SANTOS_OF_SATURDAY / EVENT_GOT_SPELL_TAG_FROM_SANTOS. Not mentioned by the walkthrough; free item for a bot that lands on Saturday.

Flags and events

constant defined in read/written by meaning for a bot
ENGINE_FLYPOINT_BLACKTHORN constants/engine_flags.asm:89 BlackthornCityFlypointCallback Fly destination unlocked
EVENT_BLACKTHORN_CITY_SUPER_NERD_BLOCKS_GYM :1157 maps/RadioTower5F.asm:111 setevent set -> that object is hidden. Set once the Radio Tower is cleared, which is what removes the blocker standing on (18, 12), the tile below the gym door
EVENT_BLACKTHORN_CITY_SUPER_NERD_DOES_NOT_BLOCK_GYM :1158 set at new game (engine/events/std_scripts.asm:460), cleared by maps/RadioTower5F.asm:112 clear -> the non-blocking nerd stands beside the door at (19, 12)
EVENT_BLACKTHORN_CITY_GRAMPS_BLOCKS_DRAGONS_DEN :1262 maps/BlackthornGym1F.asm:54 setevent after beating Clair set -> blocker at (20, 2) hidden
EVENT_BLACKTHORN_CITY_GRAMPS_NOT_BLOCKING_DRAGONS_DEN :1263 set at new game (std_scripts.asm:512), cleared by BlackthornGym1F.asm:55 clear -> permissive gramps visible at (21, 2), path to (20, 1) open
EVENT_CLEARED_RADIO_TOWER :42 read by BlackthornSuperNerdScript and BlackthornBlackBeltScript
EVENT_BLACKTHORN_CITY_SANTOS_OF_SATURDAY :1279 BlackthornCitySantosCallback weekday visibility

Items

None on the overworld map itself.

Trainers

None.

Wild encounters

Water only: data/wild/johto_water.asm:264 def_water_wildmons BLACKTHORN_CITY, 4 percent: L15 MAGIKARP, L10 MAGIKARP, L5 MAGIKARP. Fishing group FISHGROUP_POND (data/wild/fish.asm:72): Old = Magikarp/Magikarp/Poliwag L10; Good = Magikarp L20, Poliwag L20 x2, time_group 6; Super = Poliwag L40, time_group 7, Magikarp L40, Poliwag L40.

MAP_BLACKTHORN_POKECENTER_1F

  • Script: maps/BlackthornPokecenter1F.asm
  • Header: data/maps/maps.asm:183 -> TILESET_POKECENTER, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_POKEMON_CENTER, FALSE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:168 -> map_const BLACKTHORN_POKECENTER_1F, 5, 4

Warps

idx x y destination map dest warp
1 3 7 BLACKTHORN_CITY 5
2 4 7 BLACKTHORN_CITY 5
3 0 7 POKECENTER_2F 1

Object events

const sprite x y movement type script label event flag
BLACKTHORNPOKECENTER1F_NURSE SPRITE_NURSE 3 1 STANDING_DOWN OBJECTTYPE_SCRIPT BlackthornPokecenter1FNurseScript -> jumpstd PokecenterNurseScript -1
BLACKTHORNPOKECENTER1F_GENTLEMAN SPRITE_GENTLEMAN 5 3 STANDING_DOWN OBJECTTYPE_SCRIPT BlackthornPokecenter1FGentlemanScript -1
BLACKTHORNPOKECENTER1F_TWIN SPRITE_TWIN 1 4 SPINRANDOM_SLOW OBJECTTYPE_SCRIPT BlackthornPokecenter1FTwinScript -1
BLACKTHORNPOKECENTER1F_COOLTRAINER_M SPRITE_COOLTRAINER_M 7 6 WALK_LEFT_RIGHT (radius 1) OBJECTTYPE_SCRIPT BlackthornPokecenter1FCooltrainerMScript -> jumpstd HappinessCheckScript -1

No bg events, no coord events.

MAP_BLACKTHORN_MART

  • Script: maps/BlackthornMart.asm
  • Header: data/maps/maps.asm:182 -> TILESET_MART, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_AZALEA_TOWN, FALSE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:167 -> map_const BLACKTHORN_MART, 6, 4

Warps

idx x y destination map dest warp
1 2 7 BLACKTHORN_CITY 4
2 3 7 BLACKTHORN_CITY 4

Object events

const sprite x y movement type script label event flag
BLACKTHORNMART_CLERK SPRITE_CLERK 1 3 STANDING_RIGHT OBJECTTYPE_SCRIPT BlackthornMartClerkScript -1
BLACKTHORNMART_COOLTRAINER_M SPRITE_COOLTRAINER_M 7 6 WALK_LEFT_RIGHT (radius 2) OBJECTTYPE_SCRIPT BlackthornMartCooltrainerMScript -1
BLACKTHORNMART_BLACK_BELT SPRITE_BLACK_BELT 5 2 STANDING_DOWN OBJECTTYPE_SCRIPT BlackthornMartBlackBeltScript -1

Scripts of interest

BlackthornMartClerkScript -> pokemart MARTTYPE_STANDARD, MART_BLACKTHORN. Inventory, data/items/marts.asm:216 MartBlackthorn (05:63d0), 9 items: GREAT_BALL, ULTRA_BALL, HYPER_POTION, MAX_POTION, FULL_HEAL, REVIVE, MAX_REPEL, X_DEFEND, X_ATTACK. This is where the walkthrough's "restock Ultra Balls" and "have a few Revives, Full Heals, and Hyper Potions" shopping list is actually purchasable.

MAP_BLACKTHORN_EMYS_HOUSE

  • Script: maps/BlackthornEmysHouse.asm
  • Header: data/maps/maps.asm:181 -> TILESET_HOUSE, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_AZALEA_TOWN, FALSE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:166 -> map_const BLACKTHORN_EMYS_HOUSE, 4, 4

Warps

idx x y destination map dest warp
1 2 7 BLACKTHORN_CITY 3
2 3 7 BLACKTHORN_CITY 3

BG events

x y type script/item
0 1 BGEVENT_READ EmysHouseBookshelf -> jumpstd MagazineBookshelfScript
1 1 BGEVENT_READ same

Object events

const sprite x y movement type script label event flag
BLACKTHORNEMYSHOUSE_EMY SPRITE_LASS 2 3 SPINRANDOM_SLOW OBJECTTYPE_SCRIPT Emy -1

Scripts of interest

Emy -> faceplayer / opentext / trade NPC_TRADE_EMY / waitbutton / closetext / end. NPC_TRADE_EMY is index 3 (constants/npc_trade_constants.asm:20) and its row in data/events/npc_trades.asm is:

npctrade TRADE_DIALOGSET_NEWBIE, DRAGONAIR, RHYDON, "DON", $77, $66, BITTER_BERRY, 00283, "EMY", TRADE_GENDER_FEMALE

So: wants a female DRAGONAIR, gives RHYDON nicknamed "DON", DVs $77/$66, holding a BITTER_BERRY, OT "EMY" ID 00283. The walkthrough's "lady that would trade her Rhydon for a Dragonair" omits the gender requirement, which is load-bearing for a bot.

MAP_MOVE_DELETERS_HOUSE

  • Script: maps/MoveDeletersHouse.asm
  • Header: data/maps/maps.asm:184 -> TILESET_HOUSE, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_AZALEA_TOWN, FALSE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:169 -> map_const MOVE_DELETERS_HOUSE, 4, 4

Warps

idx x y destination map dest warp
1 2 7 BLACKTHORN_CITY 6
2 3 7 BLACKTHORN_CITY 6

BG events

x y type script/item
0 1 BGEVENT_READ MoveDeletersHouseBookshelf -> jumpstd DifficultBookshelfScript
1 1 BGEVENT_READ same

Object events

const sprite x y movement type script label event flag
MOVEDELETERSHOUSE_SUPER_NERD SPRITE_SUPER_NERD 2 3 STANDING_DOWN OBJECTTYPE_SCRIPT MoveDeleter -1

Scripts of interest

MoveDeleter -> faceplayer / opentext / special MoveDeletion / waitbutton / closetext / end. The whole flow lives in engine/events/move_deleter.asm; the script never writes wScriptVar.

MAP_BLACKTHORN_DRAGON_SPEECH_HOUSE

Not visited by the walkthrough; included because it is city warp 2.

  • Script: maps/BlackthornDragonSpeechHouse.asm
  • Header: data/maps/maps.asm:180 -> TILESET_HOUSE, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_AZALEA_TOWN, FALSE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:165 -> map_const BLACKTHORN_DRAGON_SPEECH_HOUSE, 4, 4

Warps: 1 = (2, 7) -> BLACKTHORN_CITY 2; 2 = (3, 7) -> BLACKTHORN_CITY 2.

Object events: BLACKTHORNDRAGONSPEECHHOUSE_GRANNY SPRITE_GRANNY at (2, 3), SPINRANDOM_SLOW, BlackthornDragonSpeechHouseGrannyScript (CLAIR and LANCE trained here); BLACKTHORNDRAGONSPEECHHOUSE_EKANS SPRITE_EKANS at (5, 5), SPRITEMOVEDATA_POKEMON, BlackthornDragonSpeechHouseDratiniScript (cry DRATINI - the sprite is EKANS but it is a Dratini).

MAP_BLACKTHORN_GYM_1F

  • Script: maps/BlackthornGym1F.asm (BlackthornGym1F_MapEvents = 53:4964, BlackthornGym1FBouldersCallback = 53:4005, BlackthornGymClairScript = 53:4024)
  • Blocks: maps/BlackthornGym1F.blk
  • Header: data/maps/maps.asm:178 -> TILESET_ELITE_FOUR_ROOM, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_GYM, phone TRUE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:163 -> map_const BLACKTHORN_GYM_1F, 5, 9
  • Callbacks: callback MAPCALLBACK_TILES, BlackthornGym1FBouldersCallback

Warps

idx x y destination map dest warp note
1 4 17 BLACKTHORN_CITY 1 door
2 5 17 BLACKTHORN_CITY 1 door
3 1 7 BLACKTHORN_GYM_2F 1 stairs
4 7 9 BLACKTHORN_GYM_2F 2 stairs
5 2 6 BLACKTHORN_GYM_2F 3 landing under 2F hole at (2, 5)
6 7 7 BLACKTHORN_GYM_2F 4 landing under 2F hole at (8, 7)
7 7 6 BLACKTHORN_GYM_2F 5 landing under 2F hole at (8, 3)

Coord events

None.

BG events

x y type script/item
3 15 BGEVENT_READ BlackthornGymStatue
6 15 BGEVENT_READ BlackthornGymStatue

Object events

const sprite x y movement type sight script label event flag
BLACKTHORNGYM1F_CLAIR SPRITE_CLAIR 5 3 STANDING_DOWN OBJECTTYPE_SCRIPT 0 BlackthornGymClairScript -1
BLACKTHORNGYM1F_COOLTRAINER_M1 SPRITE_COOLTRAINER_M 6 6 STANDING_DOWN OBJECTTYPE_TRAINER 3 TrainerCooltrainermMike -1
BLACKTHORNGYM1F_COOLTRAINER_M2 SPRITE_COOLTRAINER_M 1 14 STANDING_DOWN OBJECTTYPE_TRAINER 3 TrainerCooltrainermPaul -1
BLACKTHORNGYM1F_COOLTRAINER_F SPRITE_COOLTRAINER_F 9 2 STANDING_DOWN OBJECTTYPE_TRAINER 1 TrainerCooltrainerfLola -1
BLACKTHORNGYM1F_GYM_GUIDE SPRITE_GYM_GUIDE 7 15 STANDING_DOWN OBJECTTYPE_SCRIPT 0 BlackthornGymGuideScript -1

Scripts of interest

  • BlackthornGym1FBouldersCallback (MAPCALLBACK_TILES) - paints the fallen boulders that came through the 2F holes:

    checkevent EVENT_BOULDER_IN_BLACKTHORN_GYM_1 -> changeblock 8, 2, $3b
checkevent EVENT_BOULDER_IN_BLACKTHORN_GYM_2 -> changeblock 2, 4, $3a
checkevent EVENT_BOULDER_IN_BLACKTHORN_GYM_3 -> changeblock 8, 6, $3b

    (Script_changeblock adds 4 to both operands and then divides down to a block index, so these are block coordinates (4, 1), (1, 2) and (4, 3).)

  • BlackthornGymClairScript (53:4024) - the single most important script in this section. Control flow:

    1. checkflag ENGINE_RISINGBADGE -> .AlreadyGotBadge (53:4074).
    2. checkevent EVENT_BEAT_CLAIR -> .FightDone (53:4063).
    3. Otherwise: ClairIntroText, winlosstext ClairWinText, 0, loadtrainer CLAIR, CLAIR1, startbattle, reloadmapafterbattle, setevent EVENT_BEAT_CLAIR, ClairText_GoToDragonsDen, then a block of bookkeeping: setevent EVENT_BEAT_COOLTRAINERM_PAUL, ..._CODY, ..._MIKE, setevent EVENT_BEAT_COOLTRAINERF_FRAN, ..._LOLA (the five gym trainers are force-marked beaten), clearevent EVENT_MAHOGANY_MART_OWNERS, setevent EVENT_BLACKTHORN_CITY_GRAMPS_BLOCKS_DRAGONS_DEN, clearevent EVENT_BLACKTHORN_CITY_GRAMPS_NOT_BLOCKING_DRAGONS_DEN (this pair is what opens Dragon's Den). No badge and no TM are given here.
    4. .FightDone: checkitem DRAGON_FANG -> .HasDragonFang (BlackthornGymClairText_Cheat, "You did not get that at DRAGON'S DEN") ; else ClairText_WhatsTheMatter.
    5. .AlreadyGotBadge: checkevent EVENT_GOT_TM24_DRAGONBREATH -> .GotTM24 (BlackthornGymClairText_League); else verbosegiveitem TM_DRAGONBREATH, setevent EVENT_GOT_TM24_DRAGONBREATH. This is the fallback path for a player whose bag was full in the Den.

  • BlackthornGymStatue - checkflag ENGINE_RISINGBADGE -> jumpstd GymStatue2Script with gettrainername STRING_BUFFER_4, CLAIR, CLAIR1; else jumpstd GymStatue1Script.

  • BlackthornGymGuideScript - branches on EVENT_BEAT_CLAIR.

Flags and events

constant defined in read/written by meaning for a bot
EVENT_BEAT_CLAIR constants/event_flags.asm:713 set by BlackthornGymClairScript battle won; badge still pending
ENGINE_RISINGBADGE constants/engine_flags.asm:45 set in maps/DragonsDenB1F.asm, not here the actual 8th badge
EVENT_GOT_TM24_DRAGONBREATH constants/event_flags.asm:21 Den script, or the .AlreadyGotBadge fallback here
EVENT_BOULDER_IN_BLACKTHORN_GYM_1..3 :1192-1194 2F stone table disappear; read by the 1F tiles callback set -> boulder has fallen; 1F block repainted
EVENT_BEAT_COOLTRAINERM_PAUL / _CODY / _MIKE :859-861 trainer rows and the Clair script's bulk setevent
EVENT_BEAT_COOLTRAINERF_FRAN / _LOLA :879-880 same

Items

item how obtained source one-time flag
TM_DRAGONBREATH (TM24) Clair, only on the .AlreadyGotBadge re-talk path BlackthornGymClairScript.AlreadyGotBadge EVENT_GOT_TM24_DRAGONBREATH

Trainers

const class id party script label rematch/phone
COOLTRAINERM, PAUL CooltrainerMGroup COOLTRAINERM (3) L34 DRATINI x3; TRAINERTYPE_NORMAL TrainerCooltrainermPaul none
COOLTRAINERM, MIKE same COOLTRAINERM (5) L37 DRAGONAIR; TRAINERTYPE_NORMAL TrainerCooltrainermMike none
COOLTRAINERF, LOLA CooltrainerFGroup COOLTRAINERF (4) L34 DRATINI, L36 DRAGONAIR; TRAINERTYPE_NORMAL TrainerCooltrainerfLola none
CLAIR, CLAIR1 ClairGroup (data/trainers/parties.asm:67) CLAIR (1); TRAINERTYPE_MOVES L37 DRAGONAIR (Thunder Wave / Surf / Slam / Dragonbreath), L37 DRAGONAIR (Thunder Wave / Thunderbolt / Slam / Dragonbreath), L37 DRAGONAIR (Thunder Wave / Ice Beam / Slam / Dragonbreath), L40 KINGDRA (Smokescreen / Surf / Hyper Beam / Dragonbreath) BlackthornGymClairScript none

Note the party order: the asm sends out three Dragonair first and Kingdra last. The walkthrough lists Kingdra third.

Wild encounters

None (indoor).

MAP_BLACKTHORN_GYM_2F

  • Script: maps/BlackthornGym2F.asm (BlackthornGym2F_MapEvents = 53:4bc8, BlackthornGym2FSetUpStoneTableCallback = 53:49dd)
  • Blocks: maps/BlackthornGym2F.blk
  • Header: data/maps/maps.asm:179 -> TILESET_ELITE_FOUR_ROOM, INDOOR, LANDMARK_BLACKTHORN_CITY, MUSIC_GYM, TRUE, PALETTE_DAY
  • Dimensions: constants/map_constants.asm:164 -> map_const BLACKTHORN_GYM_2F, 5, 9
  • Callbacks: callback MAPCALLBACK_CMDQUEUE, BlackthornGym2FSetUpStoneTableCallback

Warps

idx x y destination map dest warp note
1 1 7 BLACKTHORN_GYM_1F 3 stairs
2 7 9 BLACKTHORN_GYM_1F 4 stairs
3 2 5 BLACKTHORN_GYM_1F 5 hole
4 8 7 BLACKTHORN_GYM_1F 6 hole
5 8 3 BLACKTHORN_GYM_1F 7 hole

Coord events / BG events

None.

Object events

const sprite x y movement type sight script label event flag
BLACKTHORNGYM2F_COOLTRAINER_M SPRITE_COOLTRAINER_M 4 1 STANDING_RIGHT OBJECTTYPE_TRAINER 1 TrainerCooltrainermCody -1
BLACKTHORNGYM2F_COOLTRAINER_F SPRITE_COOLTRAINER_F 4 11 STANDING_LEFT OBJECTTYPE_TRAINER 1 TrainerCooltrainerfFran -1
BLACKTHORNGYM2F_BOULDER1 SPRITE_BOULDER 8 2 STRENGTH_BOULDER OBJECTTYPE_SCRIPT 0 BlackthornGymBoulder EVENT_BOULDER_IN_BLACKTHORN_GYM_1
BLACKTHORNGYM2F_BOULDER2 SPRITE_BOULDER 2 3 STRENGTH_BOULDER OBJECTTYPE_SCRIPT 0 BlackthornGymBoulder EVENT_BOULDER_IN_BLACKTHORN_GYM_2
BLACKTHORNGYM2F_BOULDER3 SPRITE_BOULDER 6 16 STRENGTH_BOULDER OBJECTTYPE_SCRIPT 0 BlackthornGymBoulder EVENT_BOULDER_IN_BLACKTHORN_GYM_3
BLACKTHORNGYM2F_BOULDER4 SPRITE_BOULDER 3 3 STRENGTH_BOULDER OBJECTTYPE_SCRIPT 0 BlackthornGymBoulder -1
BLACKTHORNGYM2F_BOULDER5 SPRITE_BOULDER 6 1 STRENGTH_BOULDER OBJECTTYPE_SCRIPT 0 BlackthornGymBoulder -1
BLACKTHORNGYM2F_BOULDER6 SPRITE_BOULDER 8 14 STRENGTH_BOULDER OBJECTTYPE_SCRIPT 0 BlackthornGymBoulder -1

Three of the six boulders (4, 5, 6) carry no event flag and therefore never disappear - they are the bridge-building boulders, not the hole-filling ones.

Scripts of interest

  • BlackthornGym2FSetUpStoneTableCallback .StoneTable:

    stonetable 5, BLACKTHORNGYM2F_BOULDER1, .Boulder1   ; warp 5 = (8, 3)
stonetable 3, BLACKTHORNGYM2F_BOULDER2, .Boulder2   ; warp 3 = (2, 5)
stonetable 4, BLACKTHORNGYM2F_BOULDER3, .Boulder3   ; warp 4 = (8, 7)
db -1

    Note the deliberately scrambled warp order: boulder 1 belongs in warp 5, boulder 2 in warp 3, boulder 3 in warp 4.

  • Each arm does disappear BLACKTHORNGYM2F_BOULDERn (setting the matching EVENT_BOULDER_IN_BLACKTHORN_GYM_n) then .Fall: pause 30, scall .FX (playsound SFX_STRENGTH, earthquake 80), BlackthornGym2FBoulderFellText ("The boulder fell / through!").

  • BlackthornGymBoulder -> jumpstd StrengthBoulderScript for all six.

Trainers

const class id party script label rematch/phone
COOLTRAINERM, CODY CooltrainerMGroup COOLTRAINERM (4) L34 HORSEA, L36 SEADRA; TRAINERTYPE_NORMAL TrainerCooltrainermCody none
COOLTRAINERF, FRAN CooltrainerFGroup COOLTRAINERF (3) L37 SEADRA; TRAINERTYPE_NORMAL TrainerCooltrainerfFran none

MAP_DRAGONS_DEN_1F

  • Script: maps/DragonsDen1F.asm (DragonsDen1F_MapEvents = 47:44c2)
  • Blocks: maps/DragonsDen1F.blk
  • Header: data/maps/maps.asm:150 -> TILESET_CAVE, CAVE, LANDMARK_DRAGONS_DEN, MUSIC_DRAGONS_DEN, TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:137 -> map_const DRAGONS_DEN_1F, 5, 9
  • Scene scripts, callbacks, coord events, bg events, object events: all empty

Warps

idx x y destination map dest warp note
1 3 5 BLACKTHORN_CITY 8 cave mouth
2 3 3 DRAGONS_DEN_1F 4 internal ladder, pairs with warp 4
3 5 15 DRAGONS_DEN_B1F 1 the door down to the Den proper
4 5 13 DRAGONS_DEN_1F 2 internal ladder, pairs with warp 2

The "bodyguard in front of it" the walkthrough mentions is on MAP_BLACKTHORN_CITY, not here - BLACKTHORNCITY_GRAMPS1 at (20, 2).

MAP_DRAGONS_DEN_B1F

  • Script: maps/DragonsDenB1F.asm (DragonsDenB1F_MapEvents = 47:49da, DragonsDenB1FDragonFangScript = 47:44fa)
  • Blocks: maps/DragonsDenB1F.blk
  • Header: data/maps/maps.asm:151 -> TILESET_JOHTO, CAVE, LANDMARK_DRAGONS_DEN, MUSIC_DRAGONS_DEN, phone TRUE, PALETTE_NITE, FISHGROUP_DRATINI
  • Dimensions: constants/map_constants.asm:138 -> map_const DRAGONS_DEN_B1F, 20, 18
  • Attributes: data/maps/attributes.asm:470, no connections
  • Callbacks: callback MAPCALLBACK_NEWMAP, DragonsDenB1FCheckRivalCallback

Warps

idx x y destination map dest warp
1 20 3 DRAGONS_DEN_1F 3

Coord events

None.

BG events

x y type script/item
18 24 BGEVENT_READ DragonShrineSignpost
31 4 BGEVENT_ITEM DragonsDenB1FHiddenRevive -> hiddenitem REVIVE, EVENT_DRAGONS_DEN_B1F_HIDDEN_REVIVE
21 17 BGEVENT_ITEM DragonsDenB1FHiddenMaxPotion -> hiddenitem MAX_POTION, EVENT_DRAGONS_DEN_B1F_HIDDEN_MAX_POTION
31 15 BGEVENT_ITEM DragonsDenB1FHiddenMaxElixer -> hiddenitem MAX_ELIXER, EVENT_DRAGONS_DEN_B1F_HIDDEN_MAX_ELIXER

Object events

const sprite x y movement type script label event flag
DRAGONSDENB1F_POKE_BALL1 SPRITE_POKE_BALL 35 16 STILL OBJECTTYPE_SCRIPT DragonsDenB1FDragonFangScript EVENT_DRAGONS_DEN_B1F_DRAGON_FANG
DRAGONSDENB1F_CLAIR SPRITE_CLAIR 35 22 STANDING_UP OBJECTTYPE_SCRIPT ObjectEvent EVENT_DRAGONS_DEN_CLAIR
DRAGONSDENB1F_RIVAL SPRITE_RIVAL 20 23 WANDER (radius 2, 2) OBJECTTYPE_SCRIPT DragonsDenB1FRivalScript EVENT_RIVAL_DRAGONS_DEN

Note the Dragon Fang object is OBJECTTYPE_SCRIPT, not OBJECTTYPE_ITEMBALL - it runs a full script, so a bot cannot treat it as a plain pickup.

Scripts of interest

  • DragonsDenB1FDragonFangScript (47:44fa) - the badge handoff:
    1. giveitem DRAGON_FANG; iffalse .BagFullDragonFang (47:4558, which prints Text_FoundDragonFang + Text_NoRoomForDragonFang and ends without setting anything - a full bag here loses the whole scene until you return).
    2. disappear DRAGONSDENB1F_POKE_BALL1 (sets EVENT_DRAGONS_DEN_B1F_DRAGON_FANG), Text_FoundDragonFang, playsound SFX_ITEM, itemnotify.
    3. readvar VAR_FACING; ifequal RIGHT, .next -> moveobject DRAGONSDENB1F_CLAIR, 34, 21 (Clair spawns one cell over when the player grabbed the Fang facing right).
    4. appear DRAGONSDENB1F_CLAIR (clears EVENT_DRAGONS_DEN_CLAIR), applymovement DRAGONSDENB1F_CLAIR, MovementDragonsDen_ClairWalksToYou (four step UP), turnobject PLAYER, DOWN.
    5. ClairText_GiveDragonbreathDragonDen, DragonShrinePlayerReceivedRisingBadgeText, playsound SFX_GET_BADGE, setflag ENGINE_RISINGBADGE, specialphonecall SPECIALCALL_MASTERBALL, DragonShrineRisingBadgeExplanationText, verbosegiveitem TM_DRAGONBREATH, 1, setevent EVENT_GOT_TM24_DRAGONBREATH, ClairText_CollectedAllBadges (the "go to NEW BARK TOWN then SURF east" directions), then applymovement ... MovementDragonsDen_ClairWalksAway (four step DOWN) and disappear DRAGONSDENB1F_CLAIR.
  • DragonsDenB1FCheckRivalCallback - checkevent EVENT_BEAT_RIVAL_IN_MT_MOON, then readvar VAR_WEEKDAY and appears the rival only on TUESDAY or THURSDAY. Mt. Moon is post-Elite-Four, so the rival is never present during this section; DragonsDenB1FRivalScript is a talk-only scene guarded by EVENT_TEMPORARY_UNTIL_MAP_RELOAD_1.
  • DragonShrineSignpost - Gold/Silver has no separate Dragon Shrine map; the shrine is only this signpost at (18, 24).

Flags and events

constant defined in read/written by meaning for a bot
EVENT_DRAGONS_DEN_B1F_DRAGON_FANG constants/event_flags.asm:1097 disappear in the Fang script set -> Fang taken, scene done
EVENT_DRAGONS_DEN_CLAIR :1146 set at new game (std_scripts.asm), cleared by appear, re-set by the closing disappear Clair's cutscene object
ENGINE_RISINGBADGE constants/engine_flags.asm:45 setflag here 8th badge; also the Waterfall gate
EVENT_GOT_TM24_DRAGONBREATH constants/event_flags.asm:21 setevent here
SPECIALCALL_MASTERBALL constants/phone_constants.asm:52 specialphonecall here; consumed by ElmPhoneCallerScript (engine/phone/scripts/elm.asm:70 .gift) queues Elm's call; the ball itself is ElmGiveMasterBallScript in maps/ElmsLab.asm, gated on checkflag ENGINE_RISINGBADGE
EVENT_RIVAL_DRAGONS_DEN :1128 callback rival hidden until post-Mt.-Moon Tue/Thu
EVENT_DRAGONS_DEN_B1F_HIDDEN_REVIVE / _MAX_POTION / _MAX_ELIXER :170-172 hidden bg events

Items

item how obtained source one-time flag
DRAGON_FANG giveitem from the object at (35, 16) DragonsDenB1FDragonFangScript EVENT_DRAGONS_DEN_B1F_DRAGON_FANG
TM_DRAGONBREATH (TM24) verbosegiveitem from Clair right after same EVENT_GOT_TM24_DRAGONBREATH
REVIVE hidden at (31, 4) DragonsDenB1FHiddenRevive EVENT_DRAGONS_DEN_B1F_HIDDEN_REVIVE
MAX_POTION hidden at (21, 17) DragonsDenB1FHiddenMaxPotion EVENT_DRAGONS_DEN_B1F_HIDDEN_MAX_POTION
MAX_ELIXER hidden at (31, 15) DragonsDenB1FHiddenMaxElixer EVENT_DRAGONS_DEN_B1F_HIDDEN_MAX_ELIXER

Wild encounters

  • Water: data/wild/johto_water.asm:121 def_water_wildmons DRAGONS_DEN_B1F, 4 percent: L15 MAGIKARP, L10 MAGIKARP, L10 DRATINI. There is no grass table for this map; the walkthrough's "Magikarp / Dratini" list is Surf-only.
  • Fishing group FISHGROUP_DRATINI (data/maps/maps.asm:151), data/wild/fish.asm:87: Old = Magikarp L10 x3; Good = Magikarp L20 x3 + time_group 8 (Dratini L20); Super = Magikarp L40, time_group 9 (Dratini L40), Magikarp L40, DRAGONAIR L40.

3. Blockers and gates

Gate Enforced by (file:label) Requirement Unlock condition
Blackthorn Gym door at (18, 11) maps/BlackthornCity.asm object BLACKTHORNCITY_SUPER_NERD1 standing on (18, 12) with flag EVENT_BLACKTHORN_CITY_SUPER_NERD_BLOCKS_GYM that event set (object hidden) maps/RadioTower5F.asm:111-112 sets EVENT_BLACKTHORN_CITY_SUPER_NERD_BLOCKS_GYM and clears ..._DOES_NOT_BLOCK_GYM when the Radio Tower is cleared. Previous section's work; a bot arriving here without it is stuck at the gym door
Dragon's Den entrance at (20, 1) maps/BlackthornCity.asm object BLACKTHORNCITY_GRAMPS1 standing on (20, 2) with flag EVENT_BLACKTHORN_CITY_GRAMPS_BLOCKS_DRAGONS_DEN that event set (object hidden) maps/BlackthornGym1F.asm:54-55 inside BlackthornGymClairScript, immediately after setevent EVENT_BEAT_CLAIR
Ice Path B1F -> Blackthorn side maps/IcePathB1F.asm IcePathB1FSetUpStoneTableCallback.StoneTable; the four SPRITEMOVEDATA_STRENGTH_BOULDER objects HM04 STRENGTH usable = ENGINE_PLAINBADGE (engine/events/overworld.asm:941 StrengthFunction.TryStrength -> CheckBadge) plus a party member that knows the move push boulder N onto warp N+2 (see the map block above). No script check gates the route - it is the .blk geometry plus the four boulders
Ice Path B3F Nevermeltice at (5, 7) maps/IcePathB3F.asm object ICEPATHB3F_ROCK at (6, 6), SPRITEMOVEDATA_SMASHABLE_ROCK, jumpstd SmashRockScript ROCK SMASH in the party; no badge check (HasRockSmash only calls CheckPartyMove) smash it
Dragon's Den B1F, reaching the Dragon Fang whirlpool block in maps/DragonsDenB1F.blk; data/collision/field_move_blocks.asm:52 WhirlpoolBlockPointers.johto = facing block $07 -> replacement $36 SURF (ENGINE_FOGBADGE, engine/events/overworld.asm:340) and WHIRLPOOL (ENGINE_GLACIERBADGE, :1077 WhirlpoolFunction.TryWhirlpool) the one $07 block on this map is block (5, 10) = walk cells x 10-11, y 20-21
Waterfall as a field move engine/events/overworld.asm:611 WaterfallFunction -> :618 ld de, ENGINE_RISINGBADGE / farcall CheckBadge ENGINE_RISINGBADGE granted by DragonsDenB1FDragonFangScript, i.e. HM07 picked up in the Ice Path is unusable for the whole of this section
Rising Badge itself maps/BlackthornGym1F.asm BlackthornGymClairScript deliberately does not setflag ENGINE_RISINGBADGE beating Clair is not sufficient maps/DragonsDenB1F.asm DragonsDenB1FDragonFangScript
Master Ball from Elm maps/ElmsLab.asm:60 checkflag ENGINE_RISINGBADGE / iftrue ElmGiveMasterBallScript ENGINE_RISINGBADGE specialphonecall SPECIALCALL_MASTERBALL from the Den queues the phone call; the item is picked up in Elm's Lab (next section)
Dragon Fang bag space DragonsDenB1FDragonFangScript giveitem DRAGON_FANG / iffalse .BagFullDragonFang free bag slot a full bag silently aborts the entire badge scene; the walkthrough's "deposit any extraneous items" advice is load bearing here

4. Bot checklist

Coordinates are asm map coordinates (object_event / warp_event values). "Pre" = precondition flag, "Post" = postcondition flag.

  1. MAP_MAHOGANY_TOWN - Fly, heal, walk east across the map connection to MAP_ROUTE_44. Pre: EVENT_CLEARED_RADIO_TOWER (else the Blackthorn gym stays blocked later).
  2. MAP_ROUTE_44 - battle TrainerPsychicPhil at (10, 9), sight 3. Post: EVENT_BEAT_PSYCHIC_PHIL.
  3. MAP_ROUTE_44 - walk to (9, 5) and talk to ROUTE44_FRUIT_TREE -> BURNT_BERRY.
  4. MAP_ROUTE_44 - walk to (30, 8), pick up Route44MaxRevive (MAX_REVIVE, not Max Repel). Post: EVENT_ROUTE_44_MAX_REVIVE.
  5. MAP_ROUTE_44 - battle TrainerFisherEdgar at (19, 13), TrainerCooltrainerfCybil at (31, 14), TrainerCooltrainermAllen at (41, 15).
  6. MAP_ROUTE_44 - pick up Route44UltraBall at (43, 2). Post: EVENT_ROUTE_44_ULTRA_BALL. Optional: hidden ELIXER at (32, 9).
  7. MAP_ROUTE_44 - battle TrainerPokemaniacZach at (35, 2), TrainerFisherWilton1 at (42, 5) (register PHONE_FISHER_WILTON), TrainerBirdKeeperVance1 at (50, 7) (register PHONE_BIRDKEEPER_VANCE).
  8. Party check before the cave: needs STRENGTH (ENGINE_PLAINBADGE already held) and ROCK SMASH. All five Ice Path maps are PALETTE_NITE (data/maps/maps.asm:131-135), not PALETTE_DARK (constants/map_data_constants.asm:38, which is what DarkCaveBlackthornEntrance uses at data/maps/maps.asm:149), so FLASH is not required.
  9. MAP_ROUTE_44 (56, 7) -> warp 1 -> MAP_ICE_PATH_1F (4, 19).
  10. MAP_ICE_PATH_1F - slide to (31, 7), take IcePath1FHMWaterfall. Post: EVENT_GOT_HM07_WATERFALL. The move is unusable until step 30.
  11. MAP_ICE_PATH_1F (37, 5) -> warp 3 -> MAP_ICE_PATH_B1F (3, 15).
  12. MAP_ICE_PATH_B1F - use STRENGTH, push ICEPATHB1F_BOULDER1 from (11, 7) onto warp 3 at (11, 2). Post: EVENT_BOULDER_IN_ICE_PATH_1 set, EVENT_BOULDER_IN_ICE_PATH_1A cleared.
  13. Push ICEPATHB1F_BOULDER2 from (7, 8) onto warp 4 at (4, 7). Post: EVENT_BOULDER_IN_ICE_PATH_2 / _2A.
  14. Push ICEPATHB1F_BOULDER3 from (8, 9) onto warp 5 at (5, 12). Post: EVENT_BOULDER_IN_ICE_PATH_3 / _3A.
  15. Push ICEPATHB1F_BOULDER4 from (17, 7) onto warp 6 at (12, 13). Post: EVENT_BOULDER_IN_ICE_PATH_4 / _4A. (STRENGTH must be re-activated after every map load - ResetBikeFlags.)
  16. Drop through any hole, or take warp 2 at (17, 3) -> MAP_ICE_PATH_B2F_MAHOGANY_SIDE (17, 1).
  17. MAP_ICE_PATH_B2F_MAHOGANY_SIDE - pick up FULL_HEAL at (8, 9) and MAX_POTION at (0, 2); optional hidden CARBOS at (0, 17).
  18. Warp 2 at (9, 11) -> MAP_ICE_PATH_B3F (3, 5).
  19. MAP_ICE_PATH_B3F - ROCK SMASH ICEPATHB3F_ROCK at (6, 6), take NEVERMELTICE at (5, 7). Post: EVENT_ICE_PATH_B3F_NEVERMELTICE.
  20. Warp 2 at (15, 5) -> MAP_ICE_PATH_B2F_BLACKTHORN_SIDE (3, 3).
  21. Take TM_REST (TM44) at (8, 16). Post: EVENT_ICE_PATH_B2F_BLACKTHORN_SIDE_TM_REST. Optional hidden ICE_HEAL at (2, 10).
  22. Warp 1 at (3, 15) -> MAP_ICE_PATH_B1F (11, 27) (south region).
  23. Take IRON at (5, 35). Post: EVENT_ICE_PATH_B1F_IRON. Optional hidden MAX_POTION at (15, 31).
  24. Warp 7 at (5, 25) -> MAP_ICE_PATH_1F (37, 13) (south region).
  25. Take PP_UP at (32, 23). Post: EVENT_ICE_PATH_1F_PP_UP.
  26. Warp 2 at (36, 27) -> MAP_BLACKTHORN_CITY (36, 9). Post: ENGINE_FLYPOINT_BLACKTHORN (via MAPCALLBACK_NEWMAP).
  27. MAP_BLACKTHORN_CITY (21, 29) -> Pokecenter, heal. (15, 29) -> Mart, buy from MartBlackthorn. Optional (29, 23) Emy trade (needs a female Dragonair), (9, 31) Move Deleter.
  28. MAP_BLACKTHORN_CITY (18, 11) -> MAP_BLACKTHORN_GYM_1F (4, 17). Pre: EVENT_BLACKTHORN_CITY_SUPER_NERD_BLOCKS_GYM set.
  29. Gym: battle TrainerCooltrainermPaul (1, 14), take warp 3 at (1, 7) to 2F; battle TrainerCooltrainerfFran (4, 11) and TrainerCooltrainermCody (4, 1); push BLACKTHORNGYM2F_BOULDER2 (2, 3) onto warp 3 (2, 5), BLACKTHORNGYM2F_BOULDER3 (6, 16) onto warp 4 (8, 7), BLACKTHORNGYM2F_BOULDER1 (8, 2) onto warp 5 (8, 3); use boulders 4, 5, 6 ((3, 3), (6, 1), (8, 14)) as bridge pieces. Back on 1F battle TrainerCooltrainermMike (6, 6) and TrainerCooltrainerfLola (9, 2). All five are force-set by the Clair script anyway, so a bot may skip them.
  30. Talk to BLACKTHORNGYM1F_CLAIR at (5, 3) -> loadtrainer CLAIR, CLAIR1. Post: EVENT_BEAT_CLAIR, plus EVENT_BLACKTHORN_CITY_GRAMPS_BLOCKS_DRAGONS_DEN set and ..._NOT_BLOCKING_DRAGONS_DEN cleared. No badge yet.
  31. Bag check: at least one free slot (see the .BagFullDragonFang trap).
  32. MAP_BLACKTHORN_CITY (20, 1) -> MAP_DRAGONS_DEN_1F (3, 5). Ladder (3, 3) -> (5, 13), then (5, 15) -> MAP_DRAGONS_DEN_B1F (20, 3).
  33. MAP_DRAGONS_DEN_B1F - SURF, dissolve the whirlpool at walk cells (10-11, 20-21), surf east to (35, 16) and take the Dragon Fang. Post: EVENT_DRAGONS_DEN_B1F_DRAGON_FANG, ENGINE_RISINGBADGE, EVENT_GOT_TM24_DRAGONBREATH, SPECIALCALL_MASTERBALL queued. Optional hidden items at (31, 4), (21, 17), (31, 15).
  34. Exit via warp 1 at (20, 3). WATERFALL is now usable. The Elm phone call fires outside; the Master Ball pickup in MAP_ELMS_LAB is the next section.

5. Port coverage

Beat Port file Status
Map headers, dimensions, warps/coord/bg/object event tables for every map above src/import/RomExtractorGen2.lua (warps, coordEvents, bgEvents, objects at lines 787-862, consumed at 973-975) implemented (data-driven from the ROM, so no per-map porting is needed)
Map script execution (checkevent, setevent, giveitem, verbosegiveitem, loadtrainer, startbattle, applymovement, moveobject, changeblock, earthquake, writecmdqueue, trade, specialphonecall) src/script/gen2/Vm.lua (490, 806, 1002, 1044, 1292, 1364, 1445) implemented
Ice Path B1F stone table (boulder -> hole -> fall) src/world/gen2/CmdQueue.lua:212-222 (ICE_PATH_B1F, warps 2-5 zero-based against objects 2-5, events 1805-1808) implemented; covered by tests/drivers/gold_icepath_boulder.lua and tests/drivers/gold_map_callbacks.lua:167
Blackthorn Gym 2F stone table src/world/gen2/CmdQueue.lua:227-230 (warps 5/3/4 -> objects 4/5/6, matching the scrambled asm order) implemented; no dedicated driver
Blackthorn Gym 1F MAPCALLBACK_TILES fallen-boulder changeblock src/script/gen2/Vm.lua:1002 implemented (generic changeblock)
STRENGTH badge gate + ResetBikeFlags clearing STRENGTH on every map load src/world/gen2/FieldMoves.lua:108 (STRENGTH = "PLAIN"), src/world/gen2/World.lua:5610-5613 implemented
WHIRLPOOL badge gate + block replacement src/world/gen2/FieldMoves.lua:109,247,540-556,624 implemented
WATERFALL badge gate (ENGINE_RISINGBADGE) src/world/gen2/FieldMoves.lua:110,253-266,528-538 implemented
ROCK SMASH (HasRockSmash inversion) src/script/gen2/CallAsm.lua:344-350 implemented
Ice tile sliding (STEP_ICE) src/world/gen2/Permissions.lua:128,142 defines ICE = {0x23, 0x2b} but the only caller is src/world/gen2/FieldMoves.lua:169; there is no STEP_ICE arm in World:movePlayer (src/world/gen2/World.lua:5876) and no CheckStandingOnIce equivalent anywhere in src/ missing - this is the single biggest gap for this section, because every Ice Path floor is an ice-slide maze. A bot can push boulders but cannot traverse the mazes as the cart does
ENGINE_FLYPOINT_BLACKTHORN / Fly to Blackthorn src/world/gen2/FieldMoves.lua:354 (LANDMARK_BLACKTHORN_CITY, SPAWN_BLACKTHORN, flag 74) implemented
Emy's NPC trade (NPC_TRADE_EMY, female Dragonair) src/core/gen2/NpcTrade.lua (gender check at :91-93), src/script/gen2/Vm.lua:1292 trade opcode implemented
Move Deleter (special MoveDeletion) src/script/gen2/Specials.lua:637 H.MoveDeletion, src/ui/gen2/MoveDeleter.lua implemented
Blackthorn Mart (pokemart MARTTYPE_STANDARD, MART_BLACKTHORN) src/ui/gen2/MartMenu.lua + extractor mart tables implemented (generic)
Vance / Wilton phone registration and rematch src/core/gen2/Phone.lua:210-215 (ids 32 and 33), rematch flags at :451-452 implemented
specialphonecall SPECIALCALL_MASTERBALL -> Elm's call src/script/gen2/Vm.lua:1364-1371, src/core/gen2/Phone.lua:402-403 ([8] = SPECIALCALL_MASTERBALL, condition outside, ElmPhoneCallerScript) implemented
Rising Badge on the trainer card / badge list src/ui/gen2/TrainerCard.lua:64,74, src/world/gen2/FieldMoves.lua:118 implemented
Clair battle, gym leader music / party generic battle path src/battle/gen2/Battle.lua + extracted data/trainers/parties.asm implemented (generic); no Blackthorn-specific driver exists under tests/drivers/gold_*.lua
End-to-end scripted run of this section - missing - the only relevant driver is tests/drivers/gold_icepath_boulder.lua, which teleports directly to ICE_PATH_B1F (9, 2) and tests one boulder

6. Unresolved / verify by hand

  • "Max Repel" on Route 44. The walkthrough says "then the item east of that trainer (Max Repel)". The asm item ball at (30, 8) is Route44MaxRevive: itemball MAX_REVIVE. There is no Max Repel object on MAP_ROUTE_44; Max Repel is a Blackthorn Mart stock item (data/items/marts.asm:224). Treat the walkthrough as wrong.
  • Route 44 item list. The section header lists only "Burnt Berry, Ultra Ball" but the map also has the Max Revive ball and a hidden Elixer at (32, 9).
  • Psychic Phil's Kadabra level. Walkthrough says Level 24; data/trainers/parties.asm PSYCHIC_T (8) says db 26, KADABRA. The Natu is L24 in both.
  • "Protein" in the Ice Path. The walkthrough's final Ice Path paragraph says "Go up even more steps to get the Protein, then slide down at the very left to grab a PP Up." No PROTEIN appears in any of the five Ice Path map files, and the walkthrough's own item list for the Ice Path does not include it. The only vitamins in the Ice Path are IRON (B1F, (5, 35)) and the hidden CARBOS (B2F Mahogany Side, (0, 17)). Unresolved.
  • Ice Path item list omissions. The asm additionally has MAX_POTION (item ball, B2F Mahogany Side (0, 2)), hidden MAX_POTION (B1F (15, 31)), hidden CARBOS (B2F Mahogany (0, 17)) and hidden ICE_HEAL (B2F Blackthorn (2, 10)).
  • Ice maze direction strings. Every "right, down, right, down" style route in the walkthrough is a property of the .blk block layout and the ice-tile collision values, not of any table in the map asm. None of them were verified; a bot must derive them from maps/IcePath*.blk plus CheckIceTile (engine/overworld/player_movement.asm:274).
  • Boulder push counts. Likewise, "move the bottom boulder right, then 6 squares down..." for both the Ice Path B1F and Blackthorn Gym 2F puzzles is block-geometry, not script data. What is pinned down is the required destination warp for each boulder (see the two stone tables above); the paths between were not verified.
  • Dragon's Den whirlpool. The walkthrough says "Make sure you have ... Surf and Waterfall". The Den needs SURF and WHIRLPOOL; there is no waterfall block on MAP_DRAGONS_DEN_B1F and Waterfall is not even usable until the badge this trip awards. The single whirlpool block ($07 in TILESET_JOHTO) is at block (5, 10) of maps/DragonsDenB1F.blk; whether that is the only crossing the route needs was not verified beyond the block scan.
  • Clair's party order. Walkthrough lists Dragonair, Dragonair, Kingdra, Dragonair. ClairGroup in data/trainers/parties.asm:67 is Dragonair, Dragonair, Dragonair, Kingdra.
  • Fisher Edgar's Remoraid levels. Walkthrough says two Level 25 Remoraid; the asm agrees, but note both carry LOCK_ON / PSYBEAM / AURORA_BEAM / BUBBLEBEAM rather than default moves.
  • "use the warps to return to the entrance". The 1F <-> 2F warp pairs (1F 3/4 <-> 2F 1/2, 1F 5/6/7 <-> 2F 3/4/5) are transcribed above, but which combination the walkthrough means by "use the warps" is ambiguous.
  • Money rewards. The G values in the walkthrough (832G, 1000G, 1200G, ...) come from base money x level, computed at runtime in engine/battle/; no static table was located, so none were verified.
  • Section numbering. The file is section-13-* but its own heading reads ---- 19 > Ice Path and Blackthorn City Gym ----. Assumed to be the FAQ's internal chapter number, not a different section.
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