Partially implement Battle Bond (Gen 8) & Power Construct abilities

Both abilities are still not fully functional yet (Battle Bond does not interact with Water Shuriken yet, Power Construct does not interact with 10% Power Construct Zygarde, and both forms do not revert after a battle yet), but this is a step to having them both completed.
Battle Bond Froakie line and Power Construct 50% Zygardes (as well as Aura Break 10% Zygardes) can now randomly appear in the wild.
Expect Battle Bond to potentially change to its Gen 9 version at some point in the future, rendering Ash-Greninja inaccessible.

src/battle-scene.ts

@@ -1056,6 +1056,8 @@ export default class BattleScene extends SceneBase {
 			case Species.BASCULIN:
 			case Species.DEERLING:
 			case Species.SAWSBUCK:
+			case Species.FROAKIE:
+			case Species.FROGADIER:
 			case Species.VIVILLON:
 			case Species.FLABEBE:
 			case Species.FLOETTE:
@@ -1066,6 +1068,10 @@ export default class BattleScene extends SceneBase {
 			case Species.TATSUGIRI:
 			case Species.PALDEA_TAUROS:
 				return Utils.randSeedInt(species.forms.length);
+			case Species.GRENINJA:
+				return Utils.randSeedInt(2);
+			case Species.ZYGARDE:
+				return Utils.randSeedInt(3);
 			case Species.MINIOR:
 				return Utils.randSeedInt(6);
 			case Species.ALCREMIE:

src/data/ability.ts

@@ -1148,6 +1148,26 @@ class PostVictoryStatChangeAbAttr extends PostVictoryAbAttr {
   }
 }
 
+export class PostVictoryFormChangeAbAttr extends PostVictoryAbAttr {
+  private formFunc: (p: Pokemon) => integer;
+
+  constructor(formFunc: ((p: Pokemon) => integer)) {
+    super(true);
+
+    this.formFunc = formFunc;
+  }
+
+  applyPostVictory(pokemon: Pokemon, passive: boolean, args: any[]): boolean | Promise<boolean> {
+    const formIndex = this.formFunc(pokemon);
+    if (formIndex !== pokemon.formIndex) {
+      pokemon.scene.triggerPokemonFormChange(pokemon, SpeciesFormChangeManualTrigger, false);
+      return true;
+    }
+
+    return false;
+  }
+}
+
 export class PostKnockOutAbAttr extends AbAttr {
   applyPostKnockOut(pokemon: Pokemon, passive: boolean, knockedOut: Pokemon, args: any[]): boolean | Promise<boolean> {
     return false;
@@ -3067,17 +3087,21 @@ export function initAbilities() {
       .ignorable()
       .partial(),
     new Ability(Abilities.BATTLE_BOND, 7)
+      .attr(PostVictoryFormChangeAbAttr, p => p.getFormKey() ? 2 : 1)
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
       .attr(UnsuppressableAbilityAbAttr)
       .attr(NoFusionAbilityAbAttr)
-      .unimplemented(),
+      .partial(),
-    new Ability(Abilities.POWER_CONSTRUCT, 7)
+    new Ability(Abilities.POWER_CONSTRUCT, 7) // TODO: 10% Power Construct Zygarde isn't accounted for yet. If changed, update Zygarde's getSpeciesFormIndex entry accordingly
+      .attr(PostBattleInitFormChangeAbAttr, p => p.getHpRatio() <= 0.5 ? 4 : 2)
+      .attr(PostSummonFormChangeAbAttr, p => p.getHpRatio() <= 0.5 ? 4 : 2)
+      .attr(PostTurnFormChangeAbAttr, p => p.getHpRatio() <= 0.5 ? 4 : 2)
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
       .attr(UnsuppressableAbilityAbAttr)
       .attr(NoFusionAbilityAbAttr)
-      .unimplemented(),
+      .partial(),
     new Ability(Abilities.CORROSION, 7)
       .unimplemented(),
     new Ability(Abilities.COMATOSE, 7)

src/data/pokemon-forms.ts

@@ -542,11 +542,21 @@ export const pokemonFormChanges: PokemonFormChanges = {
     new SpeciesFormChange(Species.MELOETTA, 'pirouette', 'aria', new SpeciesFormChangePostMoveTrigger(Moves.RELIC_SONG), true),
     new SpeciesFormChange(Species.MELOETTA, 'pirouette', 'aria', new SpeciesFormChangeActiveTrigger(false), true)
   ],
+  [Species.GRENINJA]: [
+    new SpeciesFormChange(Species.GRENINJA, 'battle-bond', 'ash', new SpeciesFormChangeManualTrigger(), true),
+    new SpeciesFormChange(Species.GRENINJA, 'ash', 'battle-bond', new SpeciesFormChangeManualTrigger(), true)
+  ],
   [Species.AEGISLASH]: [
     new SpeciesFormChange(Species.AEGISLASH, 'blade', 'shield', new SpeciesFormChangePreMoveTrigger(Moves.KINGS_SHIELD), true, new SpeciesFormChangeCondition(p => p.hasAbility(Abilities.STANCE_CHANGE))),
     new SpeciesFormChange(Species.AEGISLASH, 'shield', 'blade', new SpeciesFormChangePreMoveTrigger(m => allMoves[m].category !== MoveCategory.STATUS), true, new SpeciesFormChangeCondition(p => p.hasAbility(Abilities.STANCE_CHANGE))),
     new SpeciesFormChange(Species.AEGISLASH, 'blade', 'shield', new SpeciesFormChangeActiveTrigger(false), true)
   ],
+  [Species.ZYGARDE]: [
+    new SpeciesFormChange(Species.ZYGARDE, '50-pc', 'complete', new SpeciesFormChangeManualTrigger(), true),
+    new SpeciesFormChange(Species.ZYGARDE, 'complete', '50-pc', new SpeciesFormChangeManualTrigger(), true),
+    new SpeciesFormChange(Species.ZYGARDE, '10-pc', 'complete', new SpeciesFormChangeManualTrigger(), true),
+    new SpeciesFormChange(Species.ZYGARDE, 'complete', '10-pc', new SpeciesFormChangeManualTrigger(), true)
+  ],
   [Species.DIANCIE]: [
     new SpeciesFormChange(Species.DIANCIE, '', SpeciesFormKey.MEGA, new SpeciesFormChangeItemTrigger(FormChangeItem.DIANCITE))
   ],

src/data/pokemon-species.ts

@@ -1748,8 +1748,14 @@ export function initSpecies() {
     new PokemonSpecies(Species.FENNEKIN, 6, false, false, false, "Fox Pokémon", Type.FIRE, null, 0.4, 9.4, Abilities.BLAZE, Abilities.NONE, Abilities.MAGICIAN, 307, 40, 45, 40, 62, 60, 60, 45, 70, 61, GrowthRate.MEDIUM_SLOW, 87.5, false),
     new PokemonSpecies(Species.BRAIXEN, 6, false, false, false, "Fox Pokémon", Type.FIRE, null, 1, 14.5, Abilities.BLAZE, Abilities.NONE, Abilities.MAGICIAN, 409, 59, 59, 58, 90, 70, 73, 45, 70, 143, GrowthRate.MEDIUM_SLOW, 87.5, false),
     new PokemonSpecies(Species.DELPHOX, 6, false, false, false, "Fox Pokémon", Type.FIRE, Type.PSYCHIC, 1.5, 39, Abilities.BLAZE, Abilities.NONE, Abilities.MAGICIAN, 534, 75, 69, 72, 114, 100, 104, 45, 70, 240, GrowthRate.MEDIUM_SLOW, 87.5, false),
-    new PokemonSpecies(Species.FROAKIE, 6, false, false, false, "Bubble Frog Pokémon", Type.WATER, null, 0.3, 7, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 314, 41, 56, 40, 62, 44, 71, 45, 70, 63, GrowthRate.MEDIUM_SLOW, 87.5, false),
+    new PokemonSpecies(Species.FROAKIE, 6, false, false, false, "Bubble Frog Pokémon", Type.WATER, null, 0.3, 7, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 314, 41, 56, 40, 62, 44, 71, 45, 70, 63, GrowthRate.MEDIUM_SLOW, 87.5, false, false,
-    new PokemonSpecies(Species.FROGADIER, 6, false, false, false, "Bubble Frog Pokémon", Type.WATER, null, 0.6, 10.9, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 405, 54, 63, 52, 83, 56, 97, 45, 70, 142, GrowthRate.MEDIUM_SLOW, 87.5, false),
+      new PokemonForm("Normal", "", Type.WATER, null, 0.3, 7, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 314, 41, 56, 40, 62, 44, 71, 45, 70, 63),
+      new PokemonForm("Battle Bond", "battle-bond", Type.WATER, null, 0.3, 7, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 314, 41, 56, 40, 62, 44, 71, 45, 70, 63, false, ""),
+    ),
+    new PokemonSpecies(Species.FROGADIER, 6, false, false, false, "Bubble Frog Pokémon", Type.WATER, null, 0.6, 10.9, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 405, 54, 63, 52, 83, 56, 97, 45, 70, 142, GrowthRate.MEDIUM_SLOW, 87.5, false, false,
+      new PokemonForm("Normal", "", Type.WATER, null, 0.6, 10.9, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 405, 54, 63, 52, 83, 56, 97, 45, 70, 142),
+      new PokemonForm("Battle Bond", "battle-bond", Type.WATER, null, 0.6, 10.9, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 405, 54, 63, 52, 83, 56, 97, 45, 70, 142, false, ""),
+    ),
     new PokemonSpecies(Species.GRENINJA, 6, false, false, false, "Ninja Pokémon", Type.WATER, Type.DARK, 1.5, 40, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 530, 72, 95, 67, 103, 71, 122, 45, 70, 239, GrowthRate.MEDIUM_SLOW, 87.5, false, false,
       new PokemonForm("Normal", "", Type.WATER, Type.DARK, 1.5, 40, Abilities.TORRENT, Abilities.NONE, Abilities.PROTEAN, 530, 72, 95, 67, 103, 71, 122, 45, 70, 239),
       new PokemonForm("Battle Bond", "battle-bond", Type.WATER, Type.DARK, 1.5, 40, Abilities.BATTLE_BOND, Abilities.NONE, Abilities.BATTLE_BOND, 530, 72, 95, 67, 103, 71, 122, 45, 70, 239, false, ""),