From 61be88e50c3fe0becd2c10045aa0d331764fc7bf Mon Sep 17 00:00:00 2001
From: Frederico Santos <frederico.f.santos@tecnico.ulisboa.pt>
Date: Sun, 19 May 2024 18:21:03 +0100
Subject: [PATCH] Implemented Zero-To-Hero

---
 src/data/ability.ts       | 33 ++++++++++++++++++++++++++++++++-
 src/data/pokemon-forms.ts |  4 ++++
 src/overrides.ts          |  4 ++--
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/src/data/ability.ts b/src/data/ability.ts
index b5e4a91a11c..e1e3b3bc8ce 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -1702,6 +1702,37 @@ export class PreSwitchOutHealAbAttr extends PreSwitchOutAbAttr {
   }
 }
 
+/**
+ * 
+ */
+export class PreSwitchOutFormChangeAbAttr extends PreSwitchOutAbAttr {
+  private formFunc: (p: Pokemon) => integer;
+
+  constructor(formFunc: ((p: Pokemon) => integer)) {
+    super();
+
+    this.formFunc = formFunc;
+  }
+
+  /**
+   * 
+   * @param pokemon 
+   * @param passive 
+   * @param args 
+   * @returns 
+   */
+  applyPreSwitchOut(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 PreStatChangeAbAttr extends AbAttr {
   applyPreStatChange(pokemon: Pokemon, passive: boolean, stat: BattleStat, cancelled: Utils.BooleanHolder, args: any[]): boolean | Promise<boolean> {
     return false;
@@ -3790,7 +3821,7 @@ export function initAbilities() {
       .attr(UnsuppressableAbilityAbAttr)
       .attr(NoTransformAbilityAbAttr)
       .attr(NoFusionAbilityAbAttr)
-      .unimplemented(),
+      .attr(PreSwitchOutFormChangeAbAttr, p => p.getFormKey() ? 1 : 0),
     new Ability(Abilities.COMMANDER, 9)
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
diff --git a/src/data/pokemon-forms.ts b/src/data/pokemon-forms.ts
index a8bc07e92df..f867b986901 100644
--- a/src/data/pokemon-forms.ts
+++ b/src/data/pokemon-forms.ts
@@ -556,6 +556,10 @@ export const pokemonFormChanges: PokemonFormChanges = {
     new SpeciesFormChange(Species.GRENINJA, 'battle-bond', 'ash', new SpeciesFormChangeManualTrigger(), true),
     new SpeciesFormChange(Species.GRENINJA, 'ash', 'battle-bond', new SpeciesFormChangeManualTrigger(), true)
   ],
+  [Species.PALAFIN] : [
+    new SpeciesFormChange(Species.PALAFIN, 'zero', 'hero', new SpeciesFormChangeManualTrigger(), true),
+    new SpeciesFormChange(Species.PALAFIN, 'hero', 'zero', 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))),
diff --git a/src/overrides.ts b/src/overrides.ts
index b7307ab2f7f..8a093f33f4c 100644
--- a/src/overrides.ts
+++ b/src/overrides.ts
@@ -54,8 +54,8 @@ export const STARTING_LEVEL_OVERRIDE: integer = 0;
  * default is 0 to not override
  * @example SPECIES_OVERRIDE = Species.Bulbasaur;
  */
-export const STARTER_SPECIES_OVERRIDE: Species | integer = 0;
-export const ABILITY_OVERRIDE: Abilities = Abilities.NONE;
+export const STARTER_SPECIES_OVERRIDE: Species | integer = Species.PALAFIN;
+export const ABILITY_OVERRIDE: Abilities = Abilities.ZERO_TO_HERO;
 export const PASSIVE_ABILITY_OVERRIDE: Abilities = Abilities.NONE;
 export const MOVESET_OVERRIDE: Array<Moves> = [];
 export const SHINY_OVERRIDE: boolean = false;