Fix No Guard failing OHKO Moves into Semi-Invulnerable Pokemon (#5779)

Co-authored-by: Bassoonian <[email protected]>

data/battle_scripts_1.s

@@ -3413,7 +3413,7 @@ BattleScript_EffectOHKO::
 	attackcanceler
 	attackstring
 	ppreduce
-	accuracycheck BattleScript_ButItFailed, NO_ACC_CALC_CHECK_LOCK_ON
+	accuracycheck BattleScript_ButItFailed, ACC_CURR_MOVE
 	typecalc
 	jumpifmovehadnoeffect BattleScript_HitFromAtkAnimation
 	tryKO BattleScript_KOFail

test/battle/move_effect/ohko.c

@@ -20,6 +20,22 @@ SINGLE_BATTLE_TEST("Sheer Cold doesn't affect Ice-type Pokémon")
         MESSAGE("It doesn't affect the opposing Glalie…");
     }
 }
+
+SINGLE_BATTLE_TEST("OHKO moves can hit semi-invulnerable mons when the user has No-Guard")
+{
+    GIVEN {
+        ASSUME(gMovesInfo[MOVE_SHEER_COLD].effect == EFFECT_OHKO);
+        PLAYER(SPECIES_WOBBUFFET) { Ability(ABILITY_NO_GUARD); }
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_FLY); }
+        TURN { MOVE(player, MOVE_SHEER_COLD); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_SHEER_COLD, player);
+        HP_BAR(opponent, hp: 0);
+    }
+}
+
 TO_DO_BATTLE_TEST("Fissure faints the target, skipping regular damage calculations")
 TO_DO_BATTLE_TEST("Fissure always fails if the target has a higher level than the user")
 TO_DO_BATTLE_TEST("Fissure's accuracy increases by 1% for every level the user has over the target")