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Fix Substitute zero-HP boundary

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Shane McGovern
2026-08-09 00:17:51 +01:00
parent 943ba5dcbf
commit ff91481018
3 changed files with 27 additions and 13 deletions
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src/battle/MoveEffects.lua
+5 -5
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@@ -281,11 +281,11 @@ MoveEffects.primary = {
failed = true }
end
local cost = math.floor(user.mon.stats.hp / 4)
-- substitute.asm only fails on subtraction underflow (current HP
-- strictly below maxHP/4); at equality the substitute is built and
-- the user is left standing on exactly 0 HP (it faints only when
-- the engine next checks HP, not here)
if user.mon.hp < cost then
-- A Substitute costs one quarter of max HP, rounded down. Do not let
-- the cost consume the user's last HP: the move must fail at the exact
-- boundary as well as below it, or the next turn's HP guard can leave a
-- trainer battle unable to progress.
if user.mon.hp <= cost then
return { romText(battle.data, "_TooWeakSubstituteText", "Too weak to make\na SUBSTITUTE!"),
failed = true }
end