gen1recomp/docs/gold-walkthrough/asm-walk/section-31-mount-silver-and-red.md

Section 31 - Mount Silver and Red

Source: ../section-31-mount-silver-and-red.txt Maps covered: MAP_SILVER_CAVE_OUTSIDE, MAP_SILVER_CAVE_POKECENTER_1F, MAP_SILVER_CAVE_ROOM_1, MAP_SILVER_CAVE_ROOM_2, MAP_SILVER_CAVE_ITEM_ROOMS, MAP_SILVER_CAVE_ROOM_3 (plus MAP_VICTORY_ROAD_GATE, cited only as the gate that lets you reach Route 28 in the first place). Badges / key milestones in this section: no badge. The milestone is the RED trainer battle in maps/SilverCaveRoom3.asm and the credits opcode it ends on - the last scripted event in the game.

Conventions reminder: disassembly paths are relative to the pokegold checkout root; port paths are relative to this repo root; coordinates are the raw asm values, i.e. map cell coordinates, 0-based from the map's top-left, the same space warp_event / bg_event / coord_event use. object_event rows are written in that same space (the + 4 in the object_event macro, macros/scripts/maps.asm line 130, is the internal RAM border offset, not something you add when reading the file).

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1. Route order

#	Map constant	asm file	Enter via	Leaves via	Why (walkthrough beat)
0	MAP_ROUTE_28	maps/Route28.asm (previous section)	VictoryRoadGate warps 7/8 at (1,7)/(2,7)	west map connection	"Head west and up from there and you'll be on Mt. Silver." Route 28 itself belongs to the previous section; only the hop off its west edge is in scope here.
1	MAP_SILVER_CAVE_OUTSIDE	maps/SilverCaveOutside.asm	east connection from Route28 (data/maps/attributes.asm:165, connection east, Route28, ROUTE_28, 9)	warp 2 at (18,11)	Arrive on Mt. Silver; MAPCALLBACK_NEWMAP registers the fly point. Optional detour into the Pokémon Center.
2	MAP_SILVER_CAVE_POKECENTER_1F	maps/SilverCavePokecenter1F.asm	SilverCaveOutside warp 1 at (23,19)	warps 1/2 at (3,7)/(4,7)	Heal before the climb; the granny is pure flavour.
3	MAP_SILVER_CAVE_ROOM_1	maps/SilverCaveRoom1.asm	SilverCaveOutside warp 2 at (18,11)	warp 2 at (15,1)	"When you get in, use HM Flash." Escape Rope, X Accuracy, Max Elixer, two hidden items.
4	MAP_SILVER_CAVE_ROOM_2	maps/SilverCaveRoom2.asm	SilverCaveRoom1 warp 2 at (15,1) -> lands on warp 1 at (17,31)	warp 2 at (11,5)	The Surf + Waterfall floor. Two side warps into SilverCaveItemRooms.
5	MAP_SILVER_CAVE_ITEM_ROOMS	maps/SilverCaveItemRooms.asm	SilverCaveRoom2 warp 3 at (13,21) or warp 4 at (23,3)	warps 1/2 at (13,3)/(7,15)	"use Surf on the lake, and then use Waterfall, you can go through an entrance to grab a Full Restore." Two disconnected rooms in one map.
6	MAP_SILVER_CAVE_ROOM_3	maps/SilverCaveRoom3.asm	SilverCaveRoom2 warp 2 at (11,5) -> lands on warp 1 at (9,33)	(no exit warp other than back to Room 2)	"keep going up, and you'll find a trainer." Red at (9,10); beating him runs credits.

After credits the game does not return to the overworld normally: Script_credits (engine/overworld/scripting.asm:2215) farcalls RedCredits (engine/events/halloffame.asm:34), which sets wSpawnAfterChampion = SPAWN_RED and jumps to Credits. FinishContinueFunction (engine/menus/intro_menu.asm) sees SPAWN_RED on the way back out and calls SpawnAfterRed, which sets wDefaultSpawnpoint = SPAWN_MT_SILVER and hMapEntryMethod = MAPSETUP_WARP, i.e. you respawn at data/maps/spawn_points.asm -> spawn SILVER_CAVE_OUTSIDE, 23, 20, the cell directly below the Pokémon Center door.

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2. Maps

MAP_SILVER_CAVE_OUTSIDE

• Script: maps/SilverCaveOutside.asm
• Blocks: maps/SilverCaveOutside.blk (20 x 18 blocks = 40 x 36 cells)
• Header: data/maps/maps.asm:397 -> map SilverCaveOutside, TILESET_KANTO, TOWN, LANDMARK_SILVER_CAVE, MUSIC_INDIGO_PLATEAU, FALSE, PALETTE_AUTO, FISHGROUP_POND (fields per the map macro at data/maps/maps.asm:1: tileset, environment, location, music, phone-service flag, time-of-day palette, fishing group)
• Dimensions / attributes: constants/map_constants.asm:367 (map_const SILVER_CAVE_OUTSIDE, 20, 18), group SILVER = 19, map id 2
• Connections: data/maps/attributes.asm:164-165 - map_attributes SilverCaveOutside, SILVER_CAVE_OUTSIDE, $2c / connection east, Route28, ROUTE_28, 9. No north/south/west connection.

Warps (def_warp_events)

idx	x	y	destination map	dest warp
1	23	19	SILVER_CAVE_POKECENTER_1F	1
2	18	11	SILVER_CAVE_ROOM_1	1

Coord events (def_coord_events)

None (the def_coord_events block is empty).

BG events (def_bg_events)

x	y	type	script/item
24	19	BGEVENT_READ	MtSilverPokecenterSign -> jumpstd PokecenterSignScript
17	13	BGEVENT_READ	MtSilverSign -> MtSilverSignText ("MT.SILVER")
9	25	BGEVENT_ITEM	SilverCaveOutsideHiddenFullRestore -> hiddenitem FULL_RESTORE, EVENT_SILVER_CAVE_OUTSIDE_HIDDEN_FULL_RESTORE

Object events (def_object_events)

None. def_object_events is the last line of the file with no rows after it - there is not a single NPC or item ball on the outdoor map.

Scripts of interest

• SilverCaveOutside_MapScripts (47-bank sibling; symbol 49:5f15) has an empty def_scene_scripts and one callback: callback MAPCALLBACK_NEWMAP, SilverCaveOutsideFlypointCallback.
• SilverCaveOutsideFlypointCallback (49:5f1a) is two opcodes: setflag ENGINE_FLYPOINT_SILVER_CAVE / endcallback. Simply entering the map unlocks Fly to Mt. Silver; there is no NPC or sign to talk to.

Flags and events

constant	defined in	read/written by	meaning for a bot
ENGINE_FLYPOINT_SILVER_CAVE	constants/engine_flags.asm:90	set by SilverCaveOutsideFlypointCallback	Fly destination LANDMARK_SILVER_CAVE (data/maps/flypoints.asm:16 -> SPAWN_MT_SILVER) becomes selectable. Postcondition of first entry.
EVENT_SILVER_CAVE_OUTSIDE_HIDDEN_FULL_RESTORE	constants/event_flags.asm:194	hiddenitem at bg_event (9,25)	One-shot guard on the hidden Full Restore.

Items

item	how obtained	source (label / bg_event / hidden)	one-time flag
FULL_RESTORE	hidden, needs a face-and-A or ITEMFINDER sweep at (9,25)	bg_event 9, 25, BGEVENT_ITEM, SilverCaveOutsideHiddenFullRestore	EVENT_SILVER_CAVE_OUTSIDE_HIDDEN_FULL_RESTORE

Trainers

None.

Wild encounters

data/wild/johto_grass.asm:2319, def_grass_wildmons SILVER_CAVE_OUTSIDE, encounter rate 10 percent for morn/day/nite alike. Gold column (IF DEF(_GOLD)); the Silver column swaps URSARING -> DONPHAN and is otherwise identical.

slot	morn	day	nite
1	41 TANGELA	41 TANGELA	41 TANGELA
2	42 PONYTA	42 PONYTA	42 PONYTA
3	42 URSARING (Silver: DONPHAN)	42 URSARING (Silver: DONPHAN)	42 URSARING (Silver: DONPHAN)
4	44 RAPIDASH	44 RAPIDASH	44 RAPIDASH
5	41 DODUO	41 DODUO	38 SNEASEL
6	43 DODRIO	43 DODRIO	42 SNEASEL
7	43 DODRIO	43 DODRIO	42 SNEASEL

Water (data/wild/johto_water.asm:271, def_water_wildmons SILVER_CAVE_OUTSIDE, 2 percent): 35 POLIWHIRL / 40 POLIWHIRL / 35 POLIWAG. Fishing group FISHGROUP_POND (data/wild/fish.asm:15). Headbutt: data/wild/treemon_maps.asm:39 -> TREEMON_SET_NONE, so no headbutt table.

MAP_SILVER_CAVE_POKECENTER_1F

• Script: maps/SilverCavePokecenter1F.asm
• Blocks: maps/SilverCavePokecenter1F.blk (symbol 2b:42e8 SilverCavePokecenter1F_Blocks)
• Header: data/maps/maps.asm:398 -> map SilverCavePokecenter1F, TILESET_POKECENTER, INDOOR, LANDMARK_SILVER_CAVE, MUSIC_POKEMON_CENTER, FALSE, PALETTE_DAY, FISHGROUP_SHORE
• Dimensions: constants/map_constants.asm:368 (map_const SILVER_CAVE_POKECENTER_1F, 5, 4), group SILVER = 19, map id 3
• Connections: none

Warps (def_warp_events)

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

Coord events / BG events: both blocks are empty.

Object events (def_object_events)

const	sprite	x	y	movement	type	script label	event flag
SILVERCAVEPOKECENTER1F_NURSE	SPRITE_NURSE	3	1	SPRITEMOVEDATA_STANDING_DOWN, radius 0/0, hours -1/-1, pal 0	OBJECTTYPE_SCRIPT	SilverCavePokecenter1FNurseScript (jumpstd PokecenterNurseScript)	-1 (always)
SILVERCAVEPOKECENTER1F_GRANNY	SPRITE_GRANNY	1	5	SPRITEMOVEDATA_STANDING_LEFT, radius 2/1, hours -1/-1, pal 0	OBJECTTYPE_SCRIPT	SilverCavePokecenter1FGrannyScript (jumptextfaceplayer)	-1 (always)

Flags and events / Items / Trainers: none. Wild encounters: none.

MAP_SILVER_CAVE_ROOM_1

• Script: maps/SilverCaveRoom1.asm (symbols 47:41e9 SilverCaveRoom1_MapScripts, 47:41f7 SilverCaveRoom1_MapEvents)
• Blocks: maps/SilverCaveRoom1.blk (10 x 18 blocks = 20 x 36 cells)
• Header: data/maps/maps.asm:144 -> map SilverCaveRoom1, TILESET_DARK_CAVE, CAVE, LANDMARK_SILVER_CAVE, MUSIC_LIGHTHOUSE, TRUE, PALETTE_DARK, FISHGROUP_LAKE (the TRUE is the phone-service flag: no phone calls in here)
• Dimensions: constants/map_constants.asm:131 (map_const SILVER_CAVE_ROOM_1, 10, 18), group DUNGEONS = 3, map id 66
• Connections: none (dungeon interior)

Warps (def_warp_events)

idx	x	y	destination map	dest warp
1	9	33	SILVER_CAVE_OUTSIDE	2
2	15	1	SILVER_CAVE_ROOM_2	1

Coord events (def_coord_events)

None.

BG events (def_bg_events)

x	y	type	script/item
16	23	BGEVENT_ITEM	SilverCaveRoom1HiddenDireHit -> hiddenitem DIRE_HIT, EVENT_SILVER_CAVE_ROOM_1_HIDDEN_DIRE_HIT
17	12	BGEVENT_ITEM	SilverCaveRoom1HiddenUltraBall -> hiddenitem ULTRA_BALL, EVENT_SILVER_CAVE_ROOM_1_HIDDEN_ULTRA_BALL

Object events (def_object_events)

const	sprite	x	y	movement	type	script label	event flag
SILVERCAVEROOM1_POKE_BALL1	SPRITE_POKE_BALL	4	9	SPRITEMOVEDATA_STILL, radius 0/0, hours -1/-1, pal 0	OBJECTTYPE_ITEMBALL	SilverCaveRoom1MaxElixer (itemball MAX_ELIXER)	EVENT_SILVER_CAVE_ROOM_1_MAX_ELIXER
SILVERCAVEROOM1_POKE_BALL2	SPRITE_POKE_BALL	15	29	SPRITEMOVEDATA_STILL, radius 0/0, hours -1/-1, pal 0	OBJECTTYPE_ITEMBALL	SilverCaveRoom1XAccuracy (itemball X_ACCURACY)	EVENT_SILVER_CAVE_ROOM_1_X_ACCURACY
SILVERCAVEROOM1_POKE_BALL3	SPRITE_POKE_BALL	5	30	SPRITEMOVEDATA_STILL, radius 0/0, hours -1/-1, pal 0	OBJECTTYPE_ITEMBALL	SilverCaveRoom1EscapeRope (itemball ESCAPE_ROPE)	EVENT_SILVER_CAVE_ROOM_1_ESCAPE_ROPE

Scripts of interest

SilverCaveRoom1_MapScripts has an empty def_scene_scripts and an empty def_callbacks. Nothing scripted happens on this floor; the three labels above are two-byte itemball payloads, not scripts (the itemball/hiddenitem macros lay down data that the object/bg dispatcher reads, they are not ScriptVM entry points).

Flags and events

constant	defined in	read/written by	meaning for a bot
EVENT_SILVER_CAVE_ROOM_1_MAX_ELIXER	constants/event_flags.asm:1082	object_event row (hide-when-set)	Set once the ball at (4,9) is taken.
EVENT_SILVER_CAVE_ROOM_1_X_ACCURACY	constants/event_flags.asm:1083	object_event row	Ball at (15,29).
EVENT_SILVER_CAVE_ROOM_1_ESCAPE_ROPE	constants/event_flags.asm:1084	object_event row	Ball at (5,30).
EVENT_SILVER_CAVE_ROOM_1_HIDDEN_DIRE_HIT	constants/event_flags.asm:164	hiddenitem	Hidden Dire Hit at (16,23).
EVENT_SILVER_CAVE_ROOM_1_HIDDEN_ULTRA_BALL	constants/event_flags.asm:165	hiddenitem	Hidden Ultra Ball at (17,12).

Polarity note that matters for every object row in this section: CheckObjectFlag (engine/overworld/map_objects_2.asm:31-58) masks (hides) the object when its MAPOBJECT_EVENT_FLAG is set, and Script_disappear (engine/overworld/scripting.asm:887) is exactly "set that flag". So a set flag means gone, a clear flag means present.

Items

item	how obtained	source	one-time flag
MAX_ELIXER	item ball at (4,9)	SilverCaveRoom1MaxElixer	EVENT_SILVER_CAVE_ROOM_1_MAX_ELIXER
X_ACCURACY	item ball at (15,29)	SilverCaveRoom1XAccuracy	EVENT_SILVER_CAVE_ROOM_1_X_ACCURACY
ESCAPE_ROPE	item ball at (5,30)	SilverCaveRoom1EscapeRope	EVENT_SILVER_CAVE_ROOM_1_ESCAPE_ROPE
DIRE_HIT	hidden at (16,23)	bg_event	EVENT_SILVER_CAVE_ROOM_1_HIDDEN_DIRE_HIT
ULTRA_BALL	hidden at (17,12)	bg_event	EVENT_SILVER_CAVE_ROOM_1_HIDDEN_ULTRA_BALL

Trainers: none.

Wild encounters

data/wild/johto_grass.asm:1297, def_grass_wildmons SILVER_CAVE_ROOM_1, 6 percent morn/day/nite. All three time slices are identical here.

slot	all times (Gold)	Silver difference
1	42 ONIX	-
2	44 URSARING	44 DONPHAN
3	43 GRAVELER	-
4	43 GRAVELER	-
5	45 GOLBAT	-
6	20 LARVITAR	-
7	15 LARVITAR	-

No water table for Room 1. Fishing group FISHGROUP_LAKE.

Terrain notes (derived by expanding maps/SilverCaveRoom1.blk through data/tilesets/cave_collision.asm; TilesetDarkCaveColl and TilesetCaveColl are the same label pair in gfx/tilesets.asm:106-107, so the dark-cave floor uses the ordinary cave collision table)

• Entry from outside lands on (9,33); a short corridor runs up to the long east-west floor strip at y=32 spanning x=2..16.
• The Escape Rope at (5,30) sits on a ledge cell. Gen 2 ledges are not "hop over the tile in front"; .TryJump (engine/overworld/player_movement.asm:354) reads wPlayerTileCollision, the tile the player is standing on, so you walk onto the ledge row, grab the ball, then press the ledge's direction (DOWN for COLL_HOP_DOWN) to jump two cells down onto y=32. That is exactly the walkthrough's "drop down the ledge to get the Escape Rope. Jump back down."
• (11,27) and (13,27) carry WARP_CARPET_DOWN collision but there is no warp_event at either coordinate. Treat them as decoration, not exits.

MAP_SILVER_CAVE_ROOM_2

• Script: maps/SilverCaveRoom2.asm (symbols 47:4238, 47:423d)
• Blocks: maps/SilverCaveRoom2.blk (15 x 18 blocks = 30 x 36 cells)
• Header: data/maps/maps.asm:145 -> map SilverCaveRoom2, TILESET_CAVE, CAVE, LANDMARK_SILVER_CAVE, MUSIC_LIGHTHOUSE, TRUE, PALETTE_NITE, FISHGROUP_LAKE
• Dimensions: constants/map_constants.asm:132 (map_const SILVER_CAVE_ROOM_2, 15, 18), group DUNGEONS = 3, map id 67
• Connections: none

Warps (def_warp_events)

idx	x	y	destination map	dest warp
1	17	31	SILVER_CAVE_ROOM_1	2
2	11	5	SILVER_CAVE_ROOM_3	1
3	13	21	SILVER_CAVE_ITEM_ROOMS	1
4	23	3	SILVER_CAVE_ITEM_ROOMS	2

Coord events (def_coord_events)

None.

BG events (def_bg_events)

x	y	type	script/item
14	31	BGEVENT_ITEM	SilverCaveRoom2HiddenMaxPotion -> hiddenitem MAX_POTION, EVENT_SILVER_CAVE_ROOM_2_HIDDEN_MAX_POTION

Object events: none (def_object_events is the last line, no rows).

Scripts of interest

Empty def_scene_scripts, empty def_callbacks. Room 2 is pure terrain.

Flags and events

constant	defined in	read/written by	meaning for a bot
EVENT_SILVER_CAVE_ROOM_2_HIDDEN_MAX_POTION	constants/event_flags.asm:166	hiddenitem at (14,31)	One-shot; the tile is right next to the Room 1 entrance warp at (17,31).

Items

item	how obtained	source	one-time flag
MAX_POTION	hidden at (14,31)	bg_event	EVENT_SILVER_CAVE_ROOM_2_HIDDEN_MAX_POTION

Trainers: none.

Wild encounters

Grass: data/wild/johto_grass.asm:1352, def_grass_wildmons SILVER_CAVE_ROOM_2, 6 percent morn/day/nite.

slot	morn	day	nite
1	45 QUAGSIRE	45 QUAGSIRE	45 QUAGSIRE
2	48 GOLDUCK	48 GOLDUCK	48 GOLDUCK
3	47 URSARING (Silver: DONPHAN)	47 URSARING (Silver: DONPHAN)	47 URSARING (Silver: DONPHAN)
4	45 QUAGSIRE	45 QUAGSIRE	45 MISDREAVUS
5	48 GOLBAT	48 GOLBAT	48 GOLBAT
6	20 LARVITAR	20 LARVITAR	20 LARVITAR
7	15 LARVITAR	15 LARVITAR	15 LARVITAR

Water: data/wild/johto_water.asm:100, def_water_wildmons SILVER_CAVE_ROOM_2, 2 percent: 35 SEAKING / 40 SEAKING / 35 GOLDEEN. Fishing group FISHGROUP_LAKE.

Terrain notes (expanded from maps/SilverCaveRoom2.blk + data/tilesets/cave_collision.asm; both item-room warps are behind water)

• You arrive at (17,31) and stand on the south floor shelf, y=30..31, x=14..24.
• South lake / Max Revive branch. Surf west from (14,30) onto the water at x=4..13, y=30..31. The waterfall band is x=6..11, y=28..29; Waterfall up from it reaches the water pocket at y=22..27. Come ashore at (11,25), walk north to the floor pocket x=9..14, y=22..24, and step onto the warp at (13,21) -> SILVER_CAVE_ITEM_ROOMS warp 1 -> MAX_REVIVE.
• North lake / Full Restore branch. From the mid-map floor at (11,11) step down onto the water at (11,12); the lake runs x=10..13 y=12..15 and x=12..21 y=14..15. The second waterfall band is x=18..21, y=10..13; Waterfall up lands in the pool at x=18..21, y=8..9. Come ashore at (21,7), walk up through the x=19..24 chamber to (23,4), and step onto the warp at (23,3) -> SILVER_CAVE_ITEM_ROOMS warp 2 -> FULL_RESTORE. This is the walkthrough's "use Surf on the lake, and then use Waterfall ... an entrance to grab a Full Restore."
• The Room 3 entrance is the CAVE cell at (11,5), reached on foot from the same north-central floor.
• The waterfall band at x=4..7, y=0..5 in the north-west corner has water below it (y=6..7) that is walled off on every side. It looks decorative; nothing in the asm routes through it.

MAP_SILVER_CAVE_ITEM_ROOMS

• Script: maps/SilverCaveItemRooms.asm (symbols 47:42b7, 47:42bd)
• Blocks: maps/SilverCaveItemRooms.blk (10 x 9 blocks = 20 x 18 cells)
• Header: data/maps/maps.asm:147 -> map SilverCaveItemRooms, TILESET_CAVE, CAVE, LANDMARK_SILVER_CAVE, MUSIC_LIGHTHOUSE, TRUE, PALETTE_NITE, FISHGROUP_LAKE
• Dimensions: constants/map_constants.asm:134 (map_const SILVER_CAVE_ITEM_ROOMS, 10, 9), group DUNGEONS = 3, map id 69
• Connections: none

Warps (def_warp_events)

idx	x	y	destination map	dest warp
1	13	3	SILVER_CAVE_ROOM_2	3
2	7	15	SILVER_CAVE_ROOM_2	4

Coord events / BG events: both empty.

Object events (def_object_events)

const	sprite	x	y	movement	type	script label	event flag
SILVERCAVEITEMROOMS_POKE_BALL1	SPRITE_POKE_BALL	6	3	SPRITEMOVEDATA_STILL, radius 0/0, hours -1/-1, pal 0	OBJECTTYPE_ITEMBALL	SilverCaveItemRoomsMaxRevive (itemball MAX_REVIVE)	EVENT_SILVER_CAVE_ITEM_ROOMS_MAX_REVIVE
SILVERCAVEITEMROOMS_POKE_BALL2	SPRITE_POKE_BALL	15	11	SPRITEMOVEDATA_STILL, radius 0/0, hours -1/-1, pal 0	OBJECTTYPE_ITEMBALL	SilverCaveItemRoomsFullRestore (itemball FULL_RESTORE)	EVENT_SILVER_CAVE_ITEM_ROOMS_FULL_RESTORE

Scripts of interest

Empty scene scripts and callbacks; the two labels are itemball payloads.

Flags and events

constant	defined in	read/written by	meaning for a bot
EVENT_SILVER_CAVE_ITEM_ROOMS_MAX_REVIVE	constants/event_flags.asm:1085	object_event row	Ball at (6,3), north room.
EVENT_SILVER_CAVE_ITEM_ROOMS_FULL_RESTORE	constants/event_flags.asm:1086	object_event row	Ball at (15,11), south room.

Items

item	how obtained	source	one-time flag
MAX_REVIVE	item ball at (6,3)	SilverCaveItemRoomsMaxRevive	EVENT_SILVER_CAVE_ITEM_ROOMS_MAX_REVIVE
FULL_RESTORE	item ball at (15,11)	SilverCaveItemRoomsFullRestore	EVENT_SILVER_CAVE_ITEM_ROOMS_FULL_RESTORE

Trainers: none.

Wild encounters

data/wild/johto_grass.asm:1462, def_grass_wildmons SILVER_CAVE_ITEM_ROOMS, 6 percent. Same shape as Room 2 but the night swap lands in slot 1 instead of slot 4: morn/day slot 1 is 45 QUAGSIRE, nite slot 1 is 45 MISDREAVUS; slot 4 stays 45 QUAGSIRE at all times. Slots 2/3/5/6/7 are 48 GOLDUCK / 47 URSARING (Silver: DONPHAN) / 48 GOLBAT / 20 LARVITAR / 15 LARVITAR. No water table.

Terrain notes

The map is two disconnected chambers in one 20 x 18 grid, which is why both of its warps go back to Room 2:

• North chamber, floor y=2..3 spanning x=4..15, warp 1 at (13,3), Max Revive at (6,3).
• South chamber, floor y=10..15 spanning roughly x=4..17, warp 2 at (7,15), Full Restore at (15,11).

MAP_SILVER_CAVE_ROOM_3

• Script: maps/SilverCaveRoom3.asm (symbols 47:425c SilverCaveRoom3_MapScripts, 47:425e Red, 47:429f SilverCaveRoom3_MapEvents)
• Blocks: maps/SilverCaveRoom3.blk (10 x 18 blocks = 20 x 36 cells)
• Header: data/maps/maps.asm:146 -> map SilverCaveRoom3, TILESET_CAVE, CAVE, LANDMARK_SILVER_CAVE, MUSIC_LIGHTHOUSE, TRUE, PALETTE_DAY, FISHGROUP_LAKE
• Dimensions: constants/map_constants.asm:133 (map_const SILVER_CAVE_ROOM_3, 10, 18), group DUNGEONS = 3, map id 68
• Connections: none

Warps (def_warp_events)

idx	x	y	destination map	dest warp
1	9	33	SILVER_CAVE_ROOM_2	2

Coord events (def_coord_events)

None. Red is not a trip-wire; you have to walk into him.

BG events (def_bg_events)

None.

Object events (def_object_events)

const	sprite	x	y	movement	type	script label	event flag
SILVERCAVEROOM3_RED	SPRITE_RED	9	10	SPRITEMOVEDATA_STANDING_UP, radius 0/0, hours -1/-1, pal PAL_NPC_RED	OBJECTTYPE_SCRIPT (sight range 0)	Red	EVENT_RED_IN_MT_SILVER

Note the type: Red is OBJECTTYPE_SCRIPT, not OBJECTTYPE_TRAINER. He has no sight cone, no loadtrainer in his object row, and no "trainer spotted" exclamation. You must stand next to him and press A.

Scripts of interest

Red (maps/SilverCaveRoom3.asm:9, symbol 47:425e), in order:

1. special FadeOutMusic
2. faceplayer / opentext / writetext RedSeenText ("…" / "…") / waitbutton / closetext
3. winlosstext RedWinLossText, RedWinLossText - the same "…" text for both outcomes
4. loadtrainer RED, RED1
5. startbattle
6. dontrestartmapmusic
7. reloadmapafterbattle
8. special FadeOutMusic
9. opentext / writetext RedLeavesText / waitbutton / closetext
10. special FadeOutToBlack / special ReloadSpritesNoPalettes
11. disappear SILVERCAVEROOM3_RED - sets EVENT_RED_IN_MT_SILVER
12. pause 15 / special FadeInFromBlack / pause 30
13. special HealParty
14. reanchormap
15. credits
16. end

There is no checkevent/iftrue guard anywhere in the script: the object flag is the only gate, and the script is unconditional once you talk to him. There is also no applymovement - "He flies away" in the walkthrough is prose; the asm just fades to black and disappears him.

credits is opcode $a0 (engine/overworld/scripting.asm:227). Script_credits (engine/overworld/scripting.asm:2215) farcalls RedCredits (engine/events/halloffame.asm:34), which fades to white, sets wSpawnAfterChampion = SPAWN_RED, and jumps into Credits; on return the script is force-ended and MAPSTATUS_DONE is loaded.

Flags and events

constant	defined in	read/written by	meaning for a bot
EVENT_RED_IN_MT_SILVER	constants/event_flags.asm:1284	set by InitializeEventsScript (engine/events/std_scripts.asm:526) at new game; cleared by maps/HallOfFame.asm:36; set again by disappear SILVERCAVEROOM3_RED inside Red	Set = Red hidden (see the CheckObjectFlag polarity note above). So: absent on a fresh save, present after your first Hall of Fame induction, gone once beaten, and present again after every subsequent Hall of Fame. That is the asm behind "If you want to fight Red again, beat the Elite Four again and then he'll be back at Mt. Silver."

No SCENE_* values: def_scene_scripts is empty for this map (wSilverCaveRoom3SceneID exists in WRAM at 01:d6ea but nothing writes a non-zero scene to it).

Items: none.

Trainers

const	class	id	party (data/trainers/parties.asm label)	script label	rematch/phone
RED1	RED (trainerclass RED ; 3f = 63, constants/trainer_constants.asm:637)	1	RedGroup (data/trainers/parties.asm:3143, symbol 0e:75d5)	Red	No phone number, no rematch table; he re-appears only via EVENT_RED_IN_MT_SILVER being cleared at the Hall of Fame

RedGroup, db "RED@", TRAINERTYPE_MOVES - four explicit moves per mon, in send-out order:

#	level	species	moves
1	81	PIKACHU	CHARM, QUICK_ATTACK, THUNDERBOLT, THUNDER
2	73	ESPEON	MUD_SLAP, REFLECT, SWIFT, PSYCHIC_M
3	75	SNORLAX	AMNESIA, SNORE, REST, BODY_SLAM
4	77	VENUSAUR	SUNNY_DAY, GIGA_DRAIN, SYNTHESIS, SOLARBEAM
5	77	CHARIZARD	FLAMETHROWER, WING_ATTACK, SLASH, FIRE_SPIN
6	77	BLASTOISE	RAIN_DANCE, SURF, BLIZZARD, WHIRLPOOL

Class attributes (data/trainers/attributes.asm:377-381, the ; Red block):

• items: FULL_RESTORE, FULL_RESTORE - two slots, not three
• base reward: 25
• AI: AI_BASIC | AI_SETUP | AI_SMART | AI_AGGRESSIVE | AI_CAUTIOUS | AI_STATUS | AI_RISKY
• item/switch: CONTEXT_USE | SWITCH_SOMETIMES

Prize money: ComputeTrainerReward (engine/battle/read_trainer_party.asm:300) computes wBattleReward = base_reward * wCurPartyLevel, and wCurPartyLevel at that point is the level of the last party row, i.e. Blastoise's 77. So 25 * 77 = 1925. WinTrainerBattle (engine/battle/core.asm:2292) then pays it out with ld c, 4 - four additions - giving 7700, which matches the walkthrough's "You get: 7700G" exactly. (Amulet Coin doubles it via .DoubleReward before the split; Mom's savings take a share of the four quarters.)

Wild encounters

data/wild/johto_grass.asm:1407, def_grass_wildmons SILVER_CAVE_ROOM_3, 6 percent, identical across morn/day/nite:

slot	species
1	51 GOLBAT
2	48 ONIX
3	48 GOLBAT
4	50 URSARING (Silver: DONPHAN)
5	51 GOLDUCK
6	20 LARVITAR
7	15 LARVITAR

No water table for Room 3.

Terrain notes

A single long north-south corridor. From the entrance warp at (9,33) the path runs straight up the x=9..10 column to the wide chamber at y=9..16, then to the top room; Red stands at (9,10), squarely in the corridor mouth, so you cannot pass him without triggering the fight. (11,33) also carries WARP_CARPET_DOWN collision but has no warp_event.

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3. Blockers and gates

Gate	Enforced by (file:label)	Requirement	Unlock condition
Reaching Route 28 at all (the north passage of the gate)	maps/VictoryRoadGate.asm:19 VictoryRoadGateBadgeCheckScript / VictoryRoadGateOfficerScript (symbols 5f:4fdc / 5f:4fe2), fired by coord_event 10, 11, SCENE_VICTORYROADGATE_BADGE_CHECK, VictoryRoadGateBadgeCheckScript	readvar VAR_BADGES / ifgreater NUM_JOHTO_BADGES - 1 - strictly more than 7 Johto badges	On pass: setscene SCENE_VICTORYROADGATE_NOOP, so the check never fires again. On fail: applymovement PLAYER, VictoryRoadGateStepDownMovement shoves you back one step. Note the west warps to Route 28 at (1,7)/(2,7) are below the trip-wire row; the badge scene guards the north corridor.
Mt. Silver "opened" flavour	maps/OaksLab.asm:18-45 Oak -> .CheckBadges / .OpenMtSilver	readvar VAR_BADGES / ifequal NUM_BADGES (all 16) when you talk to Prof. Oak	setevent EVENT_OPENED_MT_SILVER (constants/event_flags.asm:1265). The only other reader is maps/VictoryRoadGate.asm:118, where it is the hide-flag of the left Black Belt at (7,5). No script in any Mt. Silver map reads it, and it does not appear in a checkevent on any warp.
Room 1 darkness	engine/tilesets/timeofday_pals.asm:113 ReplaceTimeOfDayPals -> .NeedsFlash, driven by PALETTE_DARK in data/maps/maps.asm:144	STATUSFLAGS_FLASH_F in wStatusFlags, set by BlindingFlash (engine/events/field_moves.asm:12)	Use HM05 Flash. FlashFunction (engine/events/overworld.asm:271) needs ENGINE_ZEPHYRBADGE and wTimeOfDayPalset == DARKNESS_PALSET. Rooms 2/3 and the Item Rooms are PALETTE_NITE/PALETTE_DAY, so Flash is only needed for Room 1. It is a visibility gate, not a movement gate.
Room 2 lakes	SurfFunction.TrySurf (engine/events/overworld.asm:322-345)	ENGINE_FOGBADGE + a party mon with SURF + facing a WATER_TILE	Fog Badge (Morty). Blocks both Item Rooms entrances and everything past y<30 on the west lake.
Room 2 waterfalls	WaterfallFunction.TryWaterfall (engine/events/overworld.asm:611) and TryWaterfallOW (engine/events/overworld.asm:687), gated by CheckMapCanWaterfall	ENGINE_RISINGBADGE, party mon with WATERFALL, player facing UP, and wTileUp a waterfall tile	Rising Badge (Clair). Without it neither item room is reachable: the north branch (Full Restore at (23,3)) and the south branch (Max Revive at (13,21)) both sit above a waterfall band.
Red himself	maps/SilverCaveRoom3.asm:62 object row's event flag	EVENT_RED_IN_MT_SILVER must be clear	Cleared by maps/HallOfFame.asm:36, i.e. by completing the Elite Four / Lance and being inducted. Before that the object is masked by CheckObjectFlag and Room 3 is an empty corridor.

Not a gate, worth knowing: nothing in this section checks Strength, Whirlpool, Cut or Rock Smash. The walkthrough's "bring all the HMs" is advice, not a requirement - Flash, Surf and Waterfall are the only three the asm cares about, and Flash only for comfort.

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4. Bot checklist

Preconditions for the whole section: EVENT_BEAT_ELITE_FOUR set (Hall of Fame done, which is what clears EVENT_RED_IN_MT_SILVER), 8 Johto badges for the Victory Road Gate scene, ENGINE_FOGBADGE + ENGINE_RISINGBADGE for the item rooms, ENGINE_ZEPHYRBADGE + Flash for Room 1 visibility.

1. MAP_VICTORY_ROAD_GATE - walk onto (10,11) if the scene is still SCENE_VICTORYROADGATE_BADGE_CHECK; talk through VictoryRoadGateOfficerScript. Pre: VAR_BADGES > 7. Post: scene becomes SCENE_VICTORYROADGATE_NOOP. Then take warp 7 or 8 at (1,7)/(2,7) to MAP_ROUTE_28.
2. MAP_ROUTE_28 - cross west onto the map connection. Post: now on MAP_SILVER_CAVE_OUTSIDE. (Route 28 body belongs to the previous section.)
3. MAP_SILVER_CAVE_OUTSIDE - entering fires SilverCaveOutsideFlypointCallback. Post: ENGINE_FLYPOINT_SILVER_CAVE set; Fly to LANDMARK_SILVER_CAVE now works, and the respawn point is (23,20).
4. MAP_SILVER_CAVE_OUTSIDE - optional: face (9,25) and press A (or run the ITEMFINDER) for the hidden FULL_RESTORE. Pre: EVENT_SILVER_CAVE_OUTSIDE_HIDDEN_FULL_RESTORE clear. Post: it is set.
5. MAP_SILVER_CAVE_OUTSIDE - optional heal: warp 1 at (23,19) -> MAP_SILVER_CAVE_POKECENTER_1F, talk to SILVERCAVEPOKECENTER1F_NURSE at (3,1), leave by warp 1 at (3,7).
6. MAP_SILVER_CAVE_OUTSIDE - step on warp 2 at (18,11). Post: on MAP_SILVER_CAVE_ROOM_1 at (9,33).
7. MAP_SILVER_CAVE_ROOM_1 - use Flash from the party menu (FlashFunction). Pre: ENGINE_ZEPHYRBADGE, HM05 on a party mon, wTimeOfDayPalset == DARKNESS_PALSET. Post: STATUSFLAGS_FLASH_F set.
8. MAP_SILVER_CAVE_ROOM_1 - walk to SILVERCAVEROOM1_POKE_BALL3 at (5,30) and press A (approach along the ledge row from above, x=2..6 at y=30). Post: ESCAPE_ROPE in the bag, EVENT_SILVER_CAVE_ROOM_1_ESCAPE_ROPE set. Then press DOWN while standing on the ledge to hop to y=32.
9. MAP_SILVER_CAVE_ROOM_1 - SILVERCAVEROOM1_POKE_BALL2 at (15,29) -> X_ACCURACY, flag EVENT_SILVER_CAVE_ROOM_1_X_ACCURACY.
10. MAP_SILVER_CAVE_ROOM_1 - SILVERCAVEROOM1_POKE_BALL1 at (4,9) -> MAX_ELIXER, flag EVENT_SILVER_CAVE_ROOM_1_MAX_ELIXER.
11. MAP_SILVER_CAVE_ROOM_1 - optional hidden items: (17,12) ULTRA_BALL, (16,23) DIRE_HIT.
12. MAP_SILVER_CAVE_ROOM_1 - step on warp 2 at (15,1). Post: on MAP_SILVER_CAVE_ROOM_2 at (17,31).
13. MAP_SILVER_CAVE_ROOM_2 - optional hidden MAX_POTION at (14,31), two cells west of where you land.
14. MAP_SILVER_CAVE_ROOM_2 (Full Restore branch) - walk to (11,11), face down, Surf onto (11,12). Follow the lake east to x=18..21 at y=14..15, face UP on y=10 and use Waterfall. Come ashore at (21,7), walk to (23,4), step up onto the warp at (23,3). Post: on MAP_SILVER_CAVE_ITEM_ROOMS at (7,15).
15. MAP_SILVER_CAVE_ITEM_ROOMS - SILVERCAVEITEMROOMS_POKE_BALL2 at (15,11) -> FULL_RESTORE, flag EVENT_SILVER_CAVE_ITEM_ROOMS_FULL_RESTORE. Leave by warp 2 at (7,15).
16. MAP_SILVER_CAVE_ROOM_2 (Max Revive branch, optional, not in the walkthrough) - from the landing shelf walk to (14,30), Surf west, Waterfall up the x=6..11 band at y=28..29, come ashore at (11,25), walk to (13,22) and step up onto the warp at (13,21). Take SILVERCAVEITEMROOMS_POKE_BALL1 at (6,3) -> MAX_REVIVE. Leave by warp 1 at (13,3).
17. MAP_SILVER_CAVE_ROOM_2 - step on warp 2 at (11,5). Post: on MAP_SILVER_CAVE_ROOM_3 at (9,33).
18. MAP_SILVER_CAVE_ROOM_3 - walk north up the x=9..10 corridor to (9,11), face UP, press A on SILVERCAVEROOM3_RED at (9,10). Pre: EVENT_RED_IN_MT_SILVER clear. This runs Red.
19. Battle RED / RED1. Six mons, levels 81/73/75/77/77/77, two Full Restores on the AI. Post on victory: 7700 money (before Amulet Coin / Mom split), EVENT_RED_IN_MT_SILVER set by disappear, party healed by special HealParty, then credits.
20. After the credits the game re-enters at SPAWN_MT_SILVER = SILVER_CAVE_OUTSIDE (23,20) with hMapEntryMethod = MAPSETUP_WARP. Save here (the walkthrough's "After the credits roll, save").

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5. Port coverage

Beat	Port file	Status
Map headers / warps / bg events / object events for all six maps	src/import/RomExtractorGen2.lua (warp + coord + bg + object decode around lines 785-861 and 2959-2990)	implemented - the maps are decoded generically from the ROM, so no Silver Cave specific data is hand-written anywhere
itemball object rows (Escape Rope, X Accuracy, Max Elixer, Max Revive, Full Restore)	src/import/RomExtractorGen2.lua:2874, :2968 (readItemBall)	implemented
hiddenitem bg rows (Full Restore, Dire Hit, Ultra Ball, Max Potion)	src/world/gen2/HiddenItems.lua	implemented
MAPCALLBACK_NEWMAP flypoint callback	src/world/gen2/Map.lua + driver tests/drivers/gold_map_callbacks.lua	implemented
ENGINE_FLYPOINT_SILVER_CAVE -> Fly destination	src/world/gen2/FieldMoves.lua:355 (LANDMARK_SILVER_CAVE / SPAWN_MT_SILVER / flag 75), src/ui/gen2/Pokegear.lua:1478	implemented
Flash (dark-cave palette gate)	src/world/gen2/FieldMoves.lua:465-475 (flashFromMenu), badge table at :105	implemented
Surf	src/world/gen2/FieldMoves.lua:477-500, src/world/gen2/Permissions.lua	implemented
Waterfall (CheckMapCanWaterfall, .CheckContinueWaterfall)	src/world/gen2/FieldMoves.lua:253-266, :528-540	implemented
Gen 2 ledge hop (.TryJump / HI_NYBBLE_LEDGES) - needed for the Escape Rope drop in Room 1	no gen2 implementation found; src/world/gen2/Player.lua is a plain grid stepper and src/world/gen2/Permissions.lua only models LAND/WATER/WALL. src/world/OverworldController.lua:1330 checkLedgeHop is the Gen 1 model (data/tilesets/ledge_tiles.asm, standing-tile + front-tile pair) and does not match Gen 2's standing-tile-nybble rule	missing
loadtrainer / startbattle / winlosstext	src/script/gen2/Vm.lua:806, :817; opcodes in src/script/gen2/Opcodes.lua:99-105	implemented
disappear	src/script/gen2/Opcodes.lua:115, handled in src/script/gen2/Vm.lua	implemented
special FadeOutMusic / FadeOutToBlack / FadeInFromBlack / ReloadSpritesNoPalettes / HealParty	src/script/gen2/Specials.lua:450, :999, :1001, :1025, :1066	implemented
credits opcode as a terminal script op	src/script/gen2/Opcodes.lua:172, :194	implemented
Red-credits path and post-credits respawn at Mt. Silver	src/core/gen2/HallOfFame.lua:48-53, :239-259 (markRedCredits, POST_CREDITS_SPAWN.SPAWN_RED = "SPAWN_MT_SILVER"), test tests/gen2_halloffame_test.lua:171	implemented
Credits reel itself	src/ui/Credits.lua, driver tests/drivers/gold_halloffame_shots.lua	implemented (shared with the Hall of Fame credits)
Prize money (base reward x last level, x4, Mom split)	src/battle/gen2/Prize.lua	implemented - the ld c, 4 factor is modelled explicitly, which is what makes Red's 7700 come out right
Trainer AI item use (Red's two Full Restores)	src/battle/gen2/Ai.lua:1294, :1369-1375	implemented
Wild tables incl. the morn/day/nite split	src/import/RomExtractorGen2.lua:3720-3845 (JohtoGrassWildMons / JohtoWaterWildMons / FishGroups)	implemented
Trainer parties incl. RedGroup	src/import/RomExtractorGen2.lua:3859-4001 (TrainerGroups)	implemented
A driver that actually reaches Red	none - the closest are tests/drivers/gold_trainer_smoke.lua and tests/drivers/gold_halloffame_shots.lua	missing

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6. Unresolved / verify by hand

• "Items in Mount Silver: Escape Rope, Full Restore, Protein." There is no PROTEIN anywhere in maps/SilverCaveOutside.asm, SilverCaveRoom1.asm, SilverCaveRoom2.asm, SilverCaveRoom3.asm or SilverCaveItemRooms.asm. The full real list is Max Elixer, X Accuracy, Escape Rope, Max Revive, Full Restore (balls) plus hidden Full Restore, Dire Hit, Ultra Ball, Max Potion. The walkthrough's summary list is also missing the X Accuracy and Max Elixir it later tells you to pick up.
• "Pokémon in Mount Silver: ... #232 Donphan" - Donphan is the Silver column of every one of these def_grass_wildmons blocks. In Gold the same slots are Ursaring. Same file, IF DEF(_GOLD) / ELIF DEF(_SILVER).
• "Red will have three Full Restores" - data/trainers/attributes.asm:378 gives the RED class exactly two item slots, both FULL_RESTORE. Could not find a third anywhere.
• Red's party order. The walkthrough lists Pikachu, Espeon, Blastoise, Snorlax, Charizard, Venusaur. RedGroup orders them Pikachu, Espeon, Snorlax, Venusaur, Charizard, Blastoise. Only the lead matches. The listed EXP yields (1422 / 3081 / 3465 / 2475 / 3448 / 3432) are not stored anywhere as data - they are computed from base experience and level at runtime - so they could not be confirmed against a table.
• "Espeon is a dark type that cannot be hit with ghost moves." Espeon is Psychic in data/pokemon/base_stats/espeon.asm; the ghost-immunity claim describes Umbreon/Dark. Strategy prose, not asm, but a bot following it would make bad move choices.
• "He flies away." The Red script has no applymovement and no fly animation - special FadeOutToBlack, disappear, special FadeInFromBlack. Cosmetic discrepancy only.
• Which of the two Item Rooms the walkthrough means. The text mentions only the Full Restore, which I traced to SilverCaveRoom2 warp 4 at (23,3) -> SilverCaveItemRooms warp 2 at (7,15). That mapping is derived from expanding maps/SilverCaveRoom2.blk and maps/SilverCaveItemRooms.blk through data/tilesets/cave_collision.asm, not from an explicit statement in any asm file. The Surf/Waterfall requirement on both branches comes from the same derivation. Worth confirming in-game before a bot commits to the route.
• EVENT_OPENED_MT_SILVER does nothing on these maps. The walkthrough (and common knowledge) says you need all 16 badges and a word with Prof. Oak to enter Mt. Silver. maps/OaksLab.asm does set the flag on 16 badges, but the only consumer in the whole tree is the hide-flag of a Black Belt in maps/VictoryRoadGate.asm:118. I could not find a checkevent on that flag guarding any warp, coord event or NPC on the Route 28 / Silver Cave path. If the 16-badge requirement is real it is enforced somewhere I did not locate - verify by hand before assuming a bot with 8 Johto badges can walk in.
• Two WARP_CARPET_DOWN cells with no warp_event: (11,27) and (13,27) in Room 1, and (11,33) in Room 3. Collision says "warp", the event table says nothing. Assumed decorative; not tested.