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;
   }
 }