Use nature override property instead of overwriting base nature

src/data/ability.ts

@@ -1503,7 +1503,7 @@ export class SyncEncounterNatureAbAttr extends AbAttr {
   }
 
   apply(pokemon: Pokemon, cancelled: Utils.BooleanHolder, args: any[]): boolean {
-    (args[0] as Pokemon).setNature(pokemon.nature);
+    (args[0] as Pokemon).setNature(pokemon.getNature());
 
     return true;
   }

src/data/daily-run.ts

@@ -64,7 +64,7 @@ function getDailyRunStarter(scene: BattleScene, starterSpeciesForm: PokemonSpeci
   const starter: Starter = {
     species: starterSpecies,
     dexAttr: pokemon.getDexAttr(),
-    nature: pokemon.nature,
+    nature: pokemon.getNature(),
     pokerus: pokemon.pokerus
   };
   pokemon.destroy();

src/data/pokemon-evolutions.ts

@@ -1038,7 +1038,7 @@ export const pokemonEvolutions: PokemonEvolutions = {
   ],
   [Species.TOXEL]: [
     new SpeciesFormEvolution(Species.TOXTRICITY, '', 'lowkey', 30, null,
-      new SpeciesEvolutionCondition(p => [ Nature.LONELY, Nature.BOLD, Nature.RELAXED, Nature.TIMID, Nature.SERIOUS, Nature.MODEST, Nature.MILD, Nature.QUIET, Nature.BASHFUL, Nature.CALM, Nature.GENTLE, Nature.CAREFUL ].indexOf(p.nature) > -1)),
+      new SpeciesEvolutionCondition(p => [ Nature.LONELY, Nature.BOLD, Nature.RELAXED, Nature.TIMID, Nature.SERIOUS, Nature.MODEST, Nature.MILD, Nature.QUIET, Nature.BASHFUL, Nature.CALM, Nature.GENTLE, Nature.CAREFUL ].indexOf(p.getNature()) > -1)),
     new SpeciesFormEvolution(Species.TOXTRICITY, '', 'amped', 30, null, null)
   ],
   [Species.SIZZLIPEDE]: [

src/data/pokemon-forms.ts

@@ -293,7 +293,7 @@ export class SpeciesDefaultFormMatchTrigger extends SpeciesFormChangeTrigger {
   }
 
   canChange(pokemon: Pokemon): boolean {
-    return this.formKey === pokemon.species.forms[pokemon.scene.getSpeciesFormIndex(pokemon.species, pokemon.gender, pokemon.nature, true)].formKey;
+    return this.formKey === pokemon.species.forms[pokemon.scene.getSpeciesFormIndex(pokemon.species, pokemon.gender, pokemon.getNature(), true)].formKey;
   }
 }
 

src/field/pokemon.ts

@@ -64,6 +64,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
   public stats: integer[];
   public ivs: integer[];
   public nature: Nature;
+  public natureOverride: Nature | -1;
   public moveset: PokemonMove[];
   public status: Status;
   public friendship: integer;
@@ -125,6 +126,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       this.stats = dataSource.stats;
       this.ivs = dataSource.ivs;
       this.nature = dataSource.nature || 0 as Nature;
+      this.natureOverride = dataSource.natureOverride !== undefined ? dataSource.natureOverride : -1;
       this.moveset = dataSource.moveset;
       this.status = dataSource.status;
       this.friendship = dataSource.friendship !== undefined ? dataSource.friendship : this.species.baseFriendship;
@@ -152,18 +154,18 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
             this.gender = Gender.FEMALE;
         }
       }
-
+      
-      if (this.formIndex === undefined)
-        this.formIndex = this.scene.getSpeciesFormIndex(species, this.gender, this.nature, this.isPlayer());
-
-      if (this.shiny === undefined)
-        this.trySetShiny();
-
       if (nature !== undefined)
         this.setNature(nature);
       else
         this.generateNature();
 
+      if (this.formIndex === undefined)
+        this.formIndex = this.scene.getSpeciesFormIndex(species, this.gender, this.getNature(), this.isPlayer());
+
+      if (this.shiny === undefined)
+        this.trySetShiny();
+
       this.friendship = species.baseFriendship;
       this.metLevel = level;
       this.metBiome = scene.currentBattle ? scene.arena.biomeType : -1;
@@ -560,6 +562,10 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     }
   }
 
+  getNature(): Nature {
+    return this.natureOverride !== -1 ? this.natureOverride : this.nature;
+  }
+
   setNature(nature: Nature): void {
     this.nature = nature;
     this.calculateStats();
@@ -887,7 +893,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         this.fusionGender = Gender.FEMALE;
     }
 
-    this.fusionFormIndex = this.scene.getSpeciesFormIndex(this.fusionSpecies, this.fusionGender, this.nature, true);
+    this.fusionFormIndex = this.scene.getSpeciesFormIndex(this.fusionSpecies, this.fusionGender, this.getNature(), true);
 
     this.generateName();
   }
@@ -2119,6 +2125,7 @@ export class PlayerPokemon extends Pokemon {
       const newEvolution = pokemonEvolutions[this.species.speciesId][1];
       if (newEvolution.condition.predicate(this)) {
         const newPokemon = this.scene.addPlayerPokemon(this.species, this.level, this.abilityIndex, this.formIndex, this.gender, this.shiny, this.ivs, this.nature);
+        newPokemon.natureOverride = this.natureOverride;
         this.scene.getParty().push(newPokemon);
         newPokemon.evolve(newEvolution);
         const modifiers = this.scene.findModifiers(m => m instanceof PokemonHeldItemModifier

src/modifier/modifier-type.ts

@@ -271,7 +271,7 @@ export class PokemonNatureChangeModifierType extends PokemonModifierType {
   constructor(nature: Nature) {
     super(`${getNatureName(nature)} Mint`, `Changes a Pokémon\'s nature to ${getNatureName(nature, true, true, true)}`, ((_type, args) => new Modifiers.PokemonNatureChangeModifier(this, (args[0] as PlayerPokemon).id, this.nature)),
       ((pokemon: PlayerPokemon) => {
-        if (pokemon.nature === this.nature)
+        if (pokemon.getNature() === this.nature)
           return PartyUiHandler.NoEffectMessage;
         return null;
       }), `mint_${Utils.getEnumKeys(Stat).find(s => getNatureStatMultiplier(nature, Stat[s]) > 1)?.toLowerCase() || 'neutral' }`, 'mint');

src/modifier/modifier.ts

@@ -1105,7 +1105,7 @@ export class PokemonNatureChangeModifier extends ConsumablePokemonModifier {
 
   apply(args: any[]): boolean {
     const pokemon = args[0] as Pokemon;
-    pokemon.nature = this.nature;
+    pokemon.natureOverride = this.nature;
 
     return true;
   }

src/system/pokemon-data.ts

@@ -27,6 +27,7 @@ export default class PokemonData {
   public stats: integer[];
   public ivs: integer[];
   public nature: Nature;
+  public natureOverride: Nature | -1;
   public moveset: PokemonMove[];
   public status: Status;
   public friendship: integer;
@@ -64,6 +65,7 @@ export default class PokemonData {
     this.stats = source.stats;
     this.ivs = source.ivs;
     this.nature = source.nature !== undefined ? source.nature : 0 as Nature;
+    this.natureOverride = source.natureOverride !== undefined ? source.natureOverride : -1;
     this.friendship = source.friendship !== undefined ? source.friendship : getPokemonSpecies(this.species).baseFriendship;
     this.metLevel = source.metLevel || 5;
     this.metBiome = source.metBiome !== undefined ? source.metBiome : -1;

src/ui/pokemon-info-container.ts

@@ -121,7 +121,7 @@ export default class PokemonInfoContainer extends Phaser.GameObjects.Container {
         this.pokemonGenderText.setVisible(false);
 
       this.pokemonAbilityText.setText(pokemon.getAbility(true).name);
-      this.pokemonNatureText.setText(getNatureName(pokemon.nature, true));
+      this.pokemonNatureText.setText(getNatureName(pokemon.getNature(), true));
 
       const originalIvs: integer[] = this.scene.gameData.dexData[pokemon.species.speciesId].caughtAttr
       ? this.scene.gameData.dexData[pokemon.species.speciesId].ivs

src/ui/summary-ui-handler.ts

@@ -574,7 +574,7 @@ export default class SummaryUiHandler extends UiHandler {
           });
         }
 
-        let memoString = `${getBBCodeFrag(Utils.toReadableString(Nature[this.pokemon.nature]), TextStyle.SUMMARY_RED)}${getBBCodeFrag(' nature,', TextStyle.WINDOW_ALT)}\n${getBBCodeFrag(`${this.pokemon.metBiome === -1 ? 'apparently ' : ''}met at Lv`, TextStyle.WINDOW_ALT)}${getBBCodeFrag(this.pokemon.metLevel.toString(), TextStyle.SUMMARY_RED)}${getBBCodeFrag(',', TextStyle.WINDOW_ALT)}\n${getBBCodeFrag(getBiomeName(this.pokemon.metBiome), TextStyle.SUMMARY_RED)}${getBBCodeFrag('.', TextStyle.WINDOW_ALT)}`;
+        let memoString = `${getBBCodeFrag(Utils.toReadableString(Nature[this.pokemon.getNature()]), TextStyle.SUMMARY_RED)}${getBBCodeFrag(' nature,', TextStyle.WINDOW_ALT)}\n${getBBCodeFrag(`${this.pokemon.metBiome === -1 ? 'apparently ' : ''}met at Lv`, TextStyle.WINDOW_ALT)}${getBBCodeFrag(this.pokemon.metLevel.toString(), TextStyle.SUMMARY_RED)}${getBBCodeFrag(',', TextStyle.WINDOW_ALT)}\n${getBBCodeFrag(getBiomeName(this.pokemon.metBiome), TextStyle.SUMMARY_RED)}${getBBCodeFrag('.', TextStyle.WINDOW_ALT)}`;
        
         const memoText = addBBCodeTextObject(this.scene, 7, 113, memoString, TextStyle.WINDOW_ALT);
         memoText.setOrigin(0, 0);
@@ -593,7 +593,7 @@ export default class SummaryUiHandler extends UiHandler {
           const rowIndex = s % 3;
           const colIndex = Math.floor(s / 3);
 
-          const natureStatMultiplier = getNatureStatMultiplier(this.pokemon.nature, s);
+          const natureStatMultiplier = getNatureStatMultiplier(this.pokemon.getNature(), s);
 
           const statLabel = addTextObject(this.scene, 27 + 115 * colIndex, 56 + 16 * rowIndex, statName, natureStatMultiplier === 1 ? TextStyle.SUMMARY : natureStatMultiplier > 1 ? TextStyle.SUMMARY_PINK : TextStyle.SUMMARY_BLUE);
           statLabel.setOrigin(0.5, 0);