Support Neutralizing Gas (smogon#615)

Neutralizing Gas will completely remove the opposing Pokemon's ability, with the exception of certain abilities, the list of which was taken from the [Smogon Dex](https://www.smogon.com/dex/sv/abilities/neutralizing-gas/).

https://www.smogon.com/forums/posts/10029886

calc/src/mechanics/gen789.ts

@@ -139,7 +139,6 @@ export function calculateSMSSSV(
 
   const defenderIgnoresAbility = defender.hasAbility(
     'Full Metal Body',
-    'Neutralizing Gas',
     'Prism Armor',
     'Shadow Shield',
     'Tablets of Ruin',
@@ -168,6 +167,25 @@ export function calculateSMSSSV(
     }
   }
 
+  const ignoresNeutralizingGas = [
+    'As One (Glastrier)', 'As One (Spectrier)', 'Battle Bond', 'Comatose',
+    'Disguise', 'Gulp Missile', 'Ice Face', 'Multitype', 'Neutralizing Gas',
+    'Power Construct', 'RKS System', 'Schooling', 'Shields Down',
+    'Stance Change', 'Tera Shift', 'Zen Mode', 'Zero to Hero',
+  ];
+
+  if (attacker.hasAbility('Neutralizing Gas') &&
+    !ignoresNeutralizingGas.includes(defender.ability || '')) {
+    desc.attackerAbility = attacker.ability;
+    defender.ability = '' as AbilityName;
+  }
+
+  if (defender.hasAbility('Neutralizing Gas') &&
+    !ignoresNeutralizingGas.includes(attacker.ability || '')) {
+    desc.defenderAbility = defender.ability;
+    attacker.ability = '' as AbilityName;
+  }
+
   // Merciless does not ignore Shell Armor, damage dealt to a poisoned Pokemon with Shell Armor
   // will not be a critical hit (UltiMario)
   const isCritical = !defender.hasAbility('Battle Armor', 'Shell Armor') &&