diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index 009c3a882f..e104db758e 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -8091,6 +8091,12 @@ BattleScript_SwitchInAbilityMsg::
 	waitmessage B_WAIT_TIME_LONG
 	end3
 
+BattleScript_SwitchInAbilityMsgRet::
+	call BattleScript_AbilityPopUp
+	printfromtable gSwitchInAbilityStringIds
+	waitmessage B_WAIT_TIME_LONG
+	return
+
 BattleScript_ActivateAsOne::
 	call BattleScript_AbilityPopUp
 	printfromtable gSwitchInAbilityStringIds
@@ -8909,3 +8915,14 @@ BattleScript_DarkTypePreventsPrankster::
 	waitmessage B_WAIT_TIME_LONG
 	orhalfword gMoveResultFlags, MOVE_RESULT_NO_EFFECT
 	goto BattleScript_MoveEnd
+
+BattleScript_NeutralizingGasExits::
+	pause B_WAIT_TIME_SHORT
+	printstring STRINGID_NEUTRALIZINGGASOVER
+	waitmessage B_WAIT_TIME_LONG
+	setbyte gBattlerTarget, 0
+BattleScript_NeutralizingGasExitsLoop:
+	switchinabilities BS_TARGET
+	addbyte gBattlerTarget, 1
+	jumpifbytenotequal gBattlerTarget, gBattlersCount, BattleScript_NeutralizingGasExitsLoop
+	return
diff --git a/include/battle.h b/include/battle.h
index 5077053e35..68a40c9789 100644
--- a/include/battle.h
+++ b/include/battle.h
@@ -62,12 +62,13 @@ struct ResourceFlags
     u32 flags[4];
 };
 
-#define RESOURCE_FLAG_FLASH_FIRE     0x1
-#define RESOURCE_FLAG_ROOST          0x2
-#define RESOURCE_FLAG_UNBURDEN       0x4
-#define RESOURCE_FLAG_INTIMIDATED    0x8
-#define RESOURCE_FLAG_TRACED         0x10
-#define RESOURCE_FLAG_EMERGENCY_EXIT 0x20
+#define RESOURCE_FLAG_FLASH_FIRE        0x1
+#define RESOURCE_FLAG_ROOST             0x2
+#define RESOURCE_FLAG_UNBURDEN          0x4
+#define RESOURCE_FLAG_INTIMIDATED       0x8
+#define RESOURCE_FLAG_TRACED            0x10
+#define RESOURCE_FLAG_EMERGENCY_EXIT    0x20
+#define RESOURCE_FLAG_NEUTRALIZING_GAS  0x40
 
 struct DisableStruct
 {
@@ -181,6 +182,7 @@ struct SpecialStatus
     u8 damagedMons:4; // Mons that have been damaged directly by using a move, includes substitute.
     u8 dancerUsedMove:1;
     u8 dancerOriginalTarget:3;
+    u8 announceNeutralizingGas:1;
     s32 dmg;
     s32 physicalDmg;
     s32 specialDmg;
diff --git a/include/battle_scripts.h b/include/battle_scripts.h
index ec95a45497..1c48800113 100644
--- a/include/battle_scripts.h
+++ b/include/battle_scripts.h
@@ -261,6 +261,7 @@ extern const u8 BattleScript_AttackerAbilityStatRaiseEnd3[];
 extern const u8 BattleScript_PoisonHealActivates[];
 extern const u8 BattleScript_BadDreamsActivates[];
 extern const u8 BattleScript_SwitchInAbilityMsg[];
+extern const u8 BattleScript_SwitchInAbilityMsgRet[];
 extern const u8 BattleScript_ToxicSpikesPoisoned[];
 extern const u8 BattleScript_ToxicSpikesAbsorbed[];
 extern const u8 BattleScript_StickyWebOnSwitchIn[];
@@ -402,5 +403,6 @@ extern const u8 BattleScript_BlockedByPrimalWeatherEnd3[];
 extern const u8 BattleScript_BlockedByPrimalWeatherRet[];
 extern const u8 BattleScript_PrimalReversion[];
 extern const u8 BattleScript_HyperspaceFuryRemoveProtect[];
+extern const u8 BattleScript_NeutralizingGasExits[];
 
 #endif // GUARD_BATTLE_SCRIPTS_H
diff --git a/include/battle_util.h b/include/battle_util.h
index ee7337ef2d..32c7a53dc4 100644
--- a/include/battle_util.h
+++ b/include/battle_util.h
@@ -8,21 +8,23 @@
 #define MOVE_LIMITATION_TAUNT                   (1 << 4)
 #define MOVE_LIMITATION_IMPRISON                (1 << 5)
 
-#define ABILITYEFFECT_ON_SWITCHIN                0x0
-#define ABILITYEFFECT_ENDTURN                    0x1
-#define ABILITYEFFECT_MOVES_BLOCK                0x2
-#define ABILITYEFFECT_ABSORBING                  0x3
-#define ABILITYEFFECT_MOVE_END_ATTACKER          0x4
-#define ABILITYEFFECT_MOVE_END                   0x5
-#define ABILITYEFFECT_IMMUNITY                   0x6
-#define ABILITYEFFECT_FORECAST                   0x7
-#define ABILITYEFFECT_SYNCHRONIZE                0x8
-#define ABILITYEFFECT_ATK_SYNCHRONIZE            0x9
-#define ABILITYEFFECT_INTIMIDATE1                0xA
-#define ABILITYEFFECT_INTIMIDATE2                0xB
-#define ABILITYEFFECT_TRACE1                     0xC
-#define ABILITYEFFECT_TRACE2                     0xD
-#define ABILITYEFFECT_MOVE_END_OTHER             0xE
+#define ABILITYEFFECT_ON_SWITCHIN                0
+#define ABILITYEFFECT_ENDTURN                    1
+#define ABILITYEFFECT_MOVES_BLOCK                2
+#define ABILITYEFFECT_ABSORBING                  3
+#define ABILITYEFFECT_MOVE_END_ATTACKER          4
+#define ABILITYEFFECT_MOVE_END                   5
+#define ABILITYEFFECT_IMMUNITY                   6
+#define ABILITYEFFECT_FORECAST                   7
+#define ABILITYEFFECT_SYNCHRONIZE                8
+#define ABILITYEFFECT_ATK_SYNCHRONIZE            9
+#define ABILITYEFFECT_INTIMIDATE1                10
+#define ABILITYEFFECT_INTIMIDATE2                11
+#define ABILITYEFFECT_TRACE1                     12
+#define ABILITYEFFECT_TRACE2                     13
+#define ABILITYEFFECT_MOVE_END_OTHER             14
+#define ABILITYEFFECT_NEUTRALIZINGGAS            15
+// Special cases
 #define ABILITYEFFECT_SWITCH_IN_TERRAIN          0xFE
 #define ABILITYEFFECT_SWITCH_IN_WEATHER          0xFF
 
diff --git a/include/constants/battle_string_ids.h b/include/constants/battle_string_ids.h
index 1d461e2a00..7167296198 100644
--- a/include/constants/battle_string_ids.h
+++ b/include/constants/battle_string_ids.h
@@ -597,8 +597,10 @@
 #define STRINGID_BUTPOKEMONCANTUSETHEMOVE             594
 #define STRINGID_BUTHOOPACANTUSEIT                    595
 #define STRINGID_BROKETHROUGHPROTECTION               596
+#define STRINGID_NEUTRALIZINGGASENTERS                597
+#define STRINGID_NEUTRALIZINGGASOVER                  598
 
-#define BATTLESTRINGS_COUNT                           597
+#define BATTLESTRINGS_COUNT                           599
 
 // The below IDs are all indexes into battle message tables,
 // used to determine which of a set of messages to print.
@@ -833,6 +835,7 @@
 #define B_MSG_SWITCHIN_SCREENCLEANER    12
 #define B_MSG_SWITCHIN_ASONE            13
 #define B_MSG_SWITCHIN_CURIOUS_MEDICINE 14
+#define B_MSG_SWITCHIN_NEUTRALIZING_GAS 15
 
 // gMentalHerbCureStringIds
 #define B_MSG_MENTALHERBCURE_INFATUATION       0
diff --git a/src/battle_main.c b/src/battle_main.c
index 271e977314..19e0d49403 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -3533,7 +3533,11 @@ static void TryDoEventsBeforeFirstTurn(void)
             return;
         }
     }
-
+    
+    // Check neutralizing gas
+    if (AbilityBattleEffects(ABILITYEFFECT_NEUTRALIZINGGAS, 0, 0, 0, 0) != 0)
+        return;
+    
     // Check all switch in abilities happening from the fastest mon to slowest.
     while (gBattleStruct->switchInAbilitiesCounter < gBattlersCount)
     {
diff --git a/src/battle_message.c b/src/battle_message.c
index f26726a69a..48e7ab1a43 100644
--- a/src/battle_message.c
+++ b/src/battle_message.c
@@ -723,9 +723,12 @@ static const u8 sText_PkmnRevertedToPrimal[] = _("{B_ATK_NAME_WITH_PREFIX}'s Pri
 static const u8 sText_ButPokemonCantUseTheMove[] = _("But {B_ATK_NAME_WITH_PREFIX} can't\nuse the move!");
 static const u8 sText_ButHoopaCantUseIt[] = _("But Hoopa can't use it\nthe way it is now!");
 static const u8 sText_BrokeThroughProtection[] = _("It broke through the\n{B_DEF_NAME_WITH_PREFIX}'s protection!");
-
+static const u8 sText_NeutralizingGasEnters[] = _("Neutralizing Gas filled the area!");
+static const u8 sText_NeutralizingGasOver[] = _("The effects of Neutralizing\nGas wore off!");
 const u8 *const gBattleStringsTable[BATTLESTRINGS_COUNT] =
 {
+    [STRINGID_NEUTRALIZINGGASOVER - 12] = sText_NeutralizingGasOver,
+    [STRINGID_NEUTRALIZINGGASENTERS - 12] = sText_NeutralizingGasEnters,
     [STRINGID_BROKETHROUGHPROTECTION - 12] = sText_BrokeThroughProtection,
     [STRINGID_BUTPOKEMONCANTUSETHEMOVE - 12] = sText_ButPokemonCantUseTheMove,
     [STRINGID_BUTHOOPACANTUSEIT - 12] = sText_ButHoopaCantUseIt,
@@ -1371,6 +1374,7 @@ const u16 gSwitchInAbilityStringIds[] =
     [B_MSG_SWITCHIN_SCREENCLEANER] = STRINGID_SCREENCLEANERENTERS,
     [B_MSG_SWITCHIN_ASONE] = STRINGID_ASONEENTERS,
     [B_MSG_SWITCHIN_CURIOUS_MEDICINE] = STRINGID_CURIOUSMEDICINEENTERS,
+    [B_MSG_SWITCHIN_NEUTRALIZING_GAS] = STRINGID_NEUTRALIZINGGASENTERS,
 };
 
 const u16 gMissStringIds[] =
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index e41f0982a7..e2c6aff027 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -5416,7 +5416,7 @@ static void Cmd_sethealblock(void)
 
 static void Cmd_returnatktoball(void)
 {
-    gActiveBattler = gBattlerAttacker;
+    gActiveBattler = gBattlerAttacker;    
     if (!(gHitMarker & HITMARKER_FAINTED(gActiveBattler)))
     {
         BtlController_EmitReturnMonToBall(0, 0);
@@ -6077,8 +6077,17 @@ static void Cmd_switchineffects(void)
 
     gHitMarker &= ~(HITMARKER_FAINTED(gActiveBattler));
     gSpecialStatuses[gActiveBattler].flag40 = 0;
-
-    if (!(gSideStatuses[GetBattlerSide(gActiveBattler)] & SIDE_STATUS_SPIKES_DAMAGED)
+    
+    // Neutralizing Gas announces itself before hazards
+    if (gBattleMons[gActiveBattler].ability == ABILITY_NEUTRALIZING_GAS && gSpecialStatuses[gActiveBattler].announceNeutralizingGas == 0)
+    {
+        gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_SWITCHIN_NEUTRALIZING_GAS;
+        gSpecialStatuses[gActiveBattler].announceNeutralizingGas = TRUE;
+        gBattlerAbility = gActiveBattler;
+        BattleScriptPushCursor();
+        gBattlescriptCurrInstr = BattleScript_SwitchInAbilityMsgRet;
+    }
+    else if (!(gSideStatuses[GetBattlerSide(gActiveBattler)] & SIDE_STATUS_SPIKES_DAMAGED)
         && (gSideStatuses[GetBattlerSide(gActiveBattler)] & SIDE_STATUS_SPIKES)
         && GetBattlerAbility(gActiveBattler) != ABILITY_MAGIC_GUARD
         && IsBattlerAffectedByHazards(gActiveBattler, FALSE)
@@ -6240,7 +6249,7 @@ static void Cmd_endlinkbattle(void)
 }
 
 static void Cmd_returntoball(void)
-{
+{    
     gActiveBattler = GetBattlerForBattleScript(gBattlescriptCurrInstr[1]);
     BtlController_EmitReturnMonToBall(0, 1);
     MarkBattlerForControllerExec(gActiveBattler);
@@ -12281,25 +12290,34 @@ static void Cmd_trygetintimidatetarget(void)
 static void Cmd_switchoutabilities(void)
 {
     gActiveBattler = GetBattlerForBattleScript(gBattlescriptCurrInstr[1]);
-
-    switch (GetBattlerAbility(gActiveBattler))
+    
+    if (gBattleMons[gActiveBattler].ability == ABILITY_NEUTRALIZING_GAS)
     {
-    case ABILITY_NATURAL_CURE:
-        gBattleMons[gActiveBattler].status1 = 0;
-        BtlController_EmitSetMonData(0, REQUEST_STATUS_BATTLE, gBitTable[*(gBattleStruct->field_58 + gActiveBattler)], 4, &gBattleMons[gActiveBattler].status1);
-        MarkBattlerForControllerExec(gActiveBattler);
-        break;
-    case ABILITY_REGENERATOR:
-        gBattleMoveDamage = gBattleMons[gActiveBattler].maxHP / 3;
-        gBattleMoveDamage += gBattleMons[gActiveBattler].hp;
-        if (gBattleMoveDamage > gBattleMons[gActiveBattler].maxHP)
-            gBattleMoveDamage = gBattleMons[gActiveBattler].maxHP;
-        BtlController_EmitSetMonData(0, REQUEST_HP_BATTLE, gBitTable[*(gBattleStruct->field_58 + gActiveBattler)], 2, &gBattleMoveDamage);
-        MarkBattlerForControllerExec(gActiveBattler);
-        break;
+        gBattleMons[gActiveBattler].ability = 0;
+        BattleScriptPushCursor();
+        gBattlescriptCurrInstr = BattleScript_NeutralizingGasExits;
+    }
+    else
+    {
+        switch (GetBattlerAbility(gActiveBattler))
+        {
+        case ABILITY_NATURAL_CURE:
+            gBattleMons[gActiveBattler].status1 = 0;
+            BtlController_EmitSetMonData(0, REQUEST_STATUS_BATTLE, gBitTable[*(gBattleStruct->field_58 + gActiveBattler)], 4, &gBattleMons[gActiveBattler].status1);
+            MarkBattlerForControllerExec(gActiveBattler);
+            break;
+        case ABILITY_REGENERATOR:
+            gBattleMoveDamage = gBattleMons[gActiveBattler].maxHP / 3;
+            gBattleMoveDamage += gBattleMons[gActiveBattler].hp;
+            if (gBattleMoveDamage > gBattleMons[gActiveBattler].maxHP)
+                gBattleMoveDamage = gBattleMons[gActiveBattler].maxHP;
+            BtlController_EmitSetMonData(0, REQUEST_HP_BATTLE, gBitTable[*(gBattleStruct->field_58 + gActiveBattler)], 2, &gBattleMoveDamage);
+            MarkBattlerForControllerExec(gActiveBattler);
+            break;
+        }
+        
+        gBattlescriptCurrInstr += 2;
     }
-
-    gBattlescriptCurrInstr += 2;
 }
 
 static void Cmd_jumpifhasnohp(void)
diff --git a/src/battle_util.c b/src/battle_util.c
index 275139f4f4..0125d362c1 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -5436,6 +5436,20 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
             }
         }
         break;
+    case ABILITYEFFECT_NEUTRALIZINGGAS:
+        // for the start of battle only. The switch-in message plays in Cmd_switchineffects because it comes before the hazards
+        for (i = 0; i < gBattlersCount; i++)
+        {
+            if (gBattleMons[i].ability == ABILITY_NEUTRALIZING_GAS && !(gBattleResources->flags->flags[i] & RESOURCE_FLAG_NEUTRALIZING_GAS))
+            {
+                gBattleResources->flags->flags[i] |= RESOURCE_FLAG_NEUTRALIZING_GAS;
+                gBattlerAbility = i;
+                gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_SWITCHIN_NEUTRALIZING_GAS;
+                BattleScriptPushCursorAndCallback(BattleScript_SwitchInAbilityMsg);
+                effect++;
+            }
+        }
+        break;
     }
 
     if (effect && gLastUsedAbility != 0xFF)
@@ -5446,11 +5460,51 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
     return effect;
 }
 
+static bool32 IsNeutralizingGasBannedAbility(u32 ability)
+{
+    switch (ability)
+    {
+    case ABILITY_MULTITYPE:
+    case ABILITY_ZEN_MODE:
+    case ABILITY_STANCE_CHANGE:
+    case ABILITY_POWER_CONSTRUCT:
+    case ABILITY_SCHOOLING:
+    case ABILITY_RKS_SYSTEM:
+    case ABILITY_SHIELDS_DOWN:
+    case ABILITY_COMATOSE:
+    case ABILITY_DISGUISE:
+    case ABILITY_GULP_MISSILE:
+    case ABILITY_ICE_FACE:
+    case ABILITY_AS_ONE_ICE_RIDER:
+    case ABILITY_AS_ONE_SHADOW_RIDER:
+        return TRUE;
+    default:
+        return FALSE;
+    }
+}
+
+static bool32 IsNeutralizingGasOnField(void)
+{
+    u32 i;
+
+    for (i = 0; i < gBattlersCount; i++)
+    {
+        if (IsBattlerAlive(i) && gBattleMons[i].ability == ABILITY_NEUTRALIZING_GAS)
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
 u32 GetBattlerAbility(u8 battlerId)
 {
     if (gStatuses3[battlerId] & STATUS3_GASTRO_ACID)
         return ABILITY_NONE;
-    else if ((((gBattleMons[gBattlerAttacker].ability == ABILITY_MOLD_BREAKER
+    
+    if (IsNeutralizingGasOnField() && !IsNeutralizingGasBannedAbility(gBattleMons[battlerId].ability))
+        return ABILITY_NONE;
+    
+    if ((((gBattleMons[gBattlerAttacker].ability == ABILITY_MOLD_BREAKER
             || gBattleMons[gBattlerAttacker].ability == ABILITY_TERAVOLT
             || gBattleMons[gBattlerAttacker].ability == ABILITY_TURBOBLAZE)
             && !(gStatuses3[gBattlerAttacker] & STATUS3_GASTRO_ACID))
@@ -5460,8 +5514,8 @@ u32 GetBattlerAbility(u8 battlerId)
             && gActionsByTurnOrder[gBattlerByTurnOrder[gBattlerAttacker]] == B_ACTION_USE_MOVE
             && gCurrentTurnActionNumber < gBattlersCount)
         return ABILITY_NONE;
-    else
-        return gBattleMons[battlerId].ability;
+    
+    return gBattleMons[battlerId].ability;
 }
 
 u32 IsAbilityOnSide(u32 battlerId, u32 ability)