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-rw-r--r--battle/effect_commands.asm6
1 files changed, 6 insertions, 0 deletions
diff --git a/battle/effect_commands.asm b/battle/effect_commands.asm
index 8e0c694b3..e730c457a 100644
--- a/battle/effect_commands.asm
+++ b/battle/effect_commands.asm
@@ -1542,6 +1542,12 @@ BattleCheckTypeMatchup: ; 347c8
jr z, CheckTypeMatchup
ld hl, BattleMonType1
CheckTypeMatchup: ; 347d3
+; There is an incorrect assumption about this function made in the AI related code: when
+; the AI calls CheckTypeMatchup (not BattleCheckTypeMatchup), it assumes that placing the
+; offensive type in a will make this function do the right thing. Since a is overwritten,
+; this assumption is incorrect. A simple fix would be to load the move type for the
+; current move into a in BattleCheckTypeMatchup, before falling through, which is
+; consistent with how the rest of the code assumes this code works like.
push hl
push de
push bc