Check for the correct battler's No Guard. (#4320)

src/battle_script_commands.c

@@ -1546,7 +1546,7 @@ static bool32 AccuracyCalcHelper(u16 move)
         return TRUE;
     }
     // If the attacker has the ability No Guard and they aren't targeting a Pokemon involved in a Sky Drop with the move Sky Drop, move hits.
-    else if (GetBattlerAbility(gBattlerTarget) == ABILITY_NO_GUARD && (move != MOVE_SKY_DROP || gBattleStruct->skyDropTargets[gBattlerTarget] == 0xFF))
+    else if (GetBattlerAbility(gBattlerAttacker) == ABILITY_NO_GUARD && (move != MOVE_SKY_DROP || gBattleStruct->skyDropTargets[gBattlerTarget] == 0xFF))
     {
         if (!JumpIfMoveFailed(7, move))
             RecordAbilityBattle(gBattlerAttacker, ABILITY_NO_GUARD);