diff --git a/data/battle_anim_scripts.s b/data/battle_anim_scripts.s
index 71dcf8b2b..d7de92096 100644
--- a/data/battle_anim_scripts.s
+++ b/data/battle_anim_scripts.s
@@ -24398,18 +24398,16 @@ General_TotemFlare::
 	clearmonbg ANIM_ATTACKER
 	end
 
-General_GulpMissile: @ Modified Tackle anim (placeholder)
+General_GulpMissile: @ Tackle anim (placeholder)
 	loadspritegfx ANIM_TAG_IMPACT
 	monbg ANIM_ATTACKER
 	setalpha 12, 8
-	createsprite gHorizontalLungeSpriteTemplate, ANIM_TARGET, 2, 4, 4
+	createsprite gHorizontalLungeSpriteTemplate, ANIM_ATTACKER, 2, 4, 4
 	delay 6
-	createsprite gBasicHitSplatSpriteTemplate, ANIM_TARGET, 2, 0, 0, ANIM_ATTACKER, 2
+	createsprite gBasicHitSplatSpriteTemplate, ANIM_ATTACKER, 2, 0, 0, ANIM_ATTACKER, 2
 	createvisualtask AnimTask_ShakeMon, 2, ANIM_ATTACKER, 3, 0, 6, 1
-	playsewithpan SE_M_COMET_PUNCH, SOUND_PAN_ATTACKER
+	playsewithpan SE_M_COMET_PUNCH, SOUND_PAN_TARGET
 	waitforvisualfinish
-	delay 10
-	playse SE_EFFECTIVE
 	clearmonbg ANIM_ATTACKER
 	blendoff
 	end
diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index cf3204727..381c67a30 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -6005,9 +6005,14 @@ BattleScript_GulpMissileGorging::
 	playanimation BS_ATTACKER, B_ANIM_GULP_MISSILE, NULL
 	waitanimation
 	orword gHitMarker, HITMARKER_IGNORE_SUBSTITUTE | HITMARKER_x100000
+	effectivenesssound
+	hitanimation BS_ATTACKER
+	waitstate
+	jumpifability BS_ATTACKER, ABILITY_MAGIC_GUARD, BattleScript_GulpMissileNoDmgGorging
 	healthbarupdate BS_ATTACKER
 	datahpupdate BS_ATTACKER
 	tryfaintmon BS_ATTACKER, FALSE, NULL
+BattleScript_GulpMissileNoDmgGorging:
 	handleformchange BS_TARGET, 0
 	playanimation BS_TARGET, B_ANIM_FORM_CHANGE, NULL
 	waitanimation
@@ -6022,9 +6027,14 @@ BattleScript_GulpMissileGulping::
 	playanimation BS_ATTACKER, B_ANIM_GULP_MISSILE, NULL
 	waitanimation
 	orword gHitMarker, HITMARKER_IGNORE_SUBSTITUTE | HITMARKER_x100000
+	effectivenesssound
+	hitanimation BS_ATTACKER
+	waitstate
+	jumpifability BS_ATTACKER, ABILITY_MAGIC_GUARD, BattleScript_GulpMissileNoDmgGulping
 	healthbarupdate BS_ATTACKER
 	datahpupdate BS_ATTACKER
 	tryfaintmon BS_ATTACKER, FALSE, NULL
+BattleScript_GulpMissileNoDmgGulping:
 	handleformchange BS_TARGET, 0
 	playanimation BS_TARGET, B_ANIM_FORM_CHANGE, NULL
 	waitanimation
diff --git a/src/battle_util.c b/src/battle_util.c
index ac4257fe7..436ac4d1a 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -4985,17 +4985,22 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
             }
             break;
         case ABILITY_GULP_MISSILE:
+            gBattlerAttacker = battler;
+            gBattlerTarget = BATTLE_OPPOSITE(battler);
             if (!(gMoveResultFlags & MOVE_RESULT_NO_EFFECT)
              && !gProtectStructs[gBattlerAttacker].confusionSelfDmg
              && TARGET_TURN_DAMAGED
-             && IsBattlerAlive(battler)
-             && gBattleMons[battler].species == SPECIES_CRAMORANT_GORGING)
+             && IsBattlerAlive(gBattlerAttacker)
+             && gBattleMons[gBattlerTarget].species == SPECIES_CRAMORANT_GORGING)
             {
-                gBattleStruct->changedSpecies[gBattlerPartyIndexes[battler]] = gBattleMons[battler].species;
-                gBattleMons[battler].species = SPECIES_CRAMORANT;
-                gBattleMoveDamage = gBattleMons[gBattlerAttacker].maxHP / 4;
-                if (gBattleMoveDamage == 0)
-                    gBattleMoveDamage = 1;
+                gBattleStruct->changedSpecies[gBattlerPartyIndexes[gBattlerTarget]] = gBattleMons[gBattlerTarget].species;
+                gBattleMons[gBattlerTarget].species = SPECIES_CRAMORANT;
+                if (GetBattlerAbility(gBattlerAttacker) != ABILITY_MAGIC_GUARD)
+                {
+                    gBattleMoveDamage = gBattleMons[gBattlerAttacker].maxHP / 4;
+                    if (gBattleMoveDamage == 0)
+                        gBattleMoveDamage = 1;
+                }
                 BattleScriptPushCursor();
                 gBattlescriptCurrInstr = BattleScript_GulpMissileGorging;
                 effect++;
@@ -5003,14 +5008,17 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
             else if (!(gMoveResultFlags & MOVE_RESULT_NO_EFFECT)
              && !gProtectStructs[gBattlerAttacker].confusionSelfDmg
              && TARGET_TURN_DAMAGED
-             && IsBattlerAlive(battler)
-             && gBattleMons[battler].species == SPECIES_CRAMORANT_GULPING)
+             && IsBattlerAlive(gBattlerAttacker)
+             && gBattleMons[gBattlerTarget].species == SPECIES_CRAMORANT_GULPING)
             {
-                gBattleStruct->changedSpecies[gBattlerPartyIndexes[battler]] = gBattleMons[battler].species;
-                gBattleMons[battler].species = SPECIES_CRAMORANT;
-                gBattleMoveDamage = gBattleMons[gBattlerAttacker].maxHP / 4;
-                if (gBattleMoveDamage == 0)
-                    gBattleMoveDamage = 1;
+                gBattleStruct->changedSpecies[gBattlerPartyIndexes[gBattlerTarget]] = gBattleMons[gBattlerTarget].species;
+                gBattleMons[gBattlerTarget].species = SPECIES_CRAMORANT;
+                if (GetBattlerAbility(gBattlerAttacker) != ABILITY_MAGIC_GUARD)
+                {
+                    gBattleMoveDamage = gBattleMons[gBattlerAttacker].maxHP / 4;
+                    if (gBattleMoveDamage == 0)
+                        gBattleMoveDamage = 1;
+                }
                 SET_STATCHANGER(STAT_DEF, 1, TRUE);
                 BattleScriptPushCursor();
                 gBattlescriptCurrInstr = BattleScript_GulpMissileGulping;
@@ -5054,9 +5062,10 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
             }
             break;
         case ABILITY_GULP_MISSILE:
-            if ((effect = ShouldChangeFormHpBased(battler))
-             && (gCurrentMove == MOVE_SURF
-             || gStatuses3[battler] & STATUS3_UNDERWATER))
+            if ((effect = ShouldChangeFormHpBased(gBattlerAttacker))
+             && (gCurrentMove == MOVE_SURF || gStatuses3[gBattlerAttacker] & STATUS3_UNDERWATER)
+             && TARGET_TURN_DAMAGED
+             && IsBattlerAlive(gBattlerAttacker))
             {
                 BattleScriptPushCursor();
                 gBattlescriptCurrInstr = BattleScript_AttackerFormChange;