Don't increment seen shiny count for trainers

src/phases.ts

@@ -702,7 +702,7 @@ export class EncounterPhase extends BattlePhase {
       }
 
       if (!this.loaded)
-        this.scene.gameData.setPokemonSeen(enemyPokemon);
+        this.scene.gameData.setPokemonSeen(enemyPokemon, true, battle.battleType === BattleType.TRAINER);
 
       if (enemyPokemon.species.speciesId === Species.ETERNATUS) {
         if (this.scene.gameMode.isClassic && (battle.battleSpec === BattleSpec.FINAL_BOSS || this.scene.gameMode.isWaveFinal(battle.waveIndex))) {

src/system/game-data.ts

@@ -993,13 +993,13 @@ export class GameData {
     this.starterData = starterData;
   }
 
-  setPokemonSeen(pokemon: Pokemon, incrementCount: boolean = true): void {
+  setPokemonSeen(pokemon: Pokemon, incrementCount: boolean = true, trainer: boolean = false): void {
     const dexEntry = this.dexData[pokemon.species.speciesId];
     dexEntry.seenAttr |= pokemon.getDexAttr();
     if (incrementCount) {
       dexEntry.seenCount++;
       this.gameStats.pokemonSeen++;
-      if (pokemon.isShiny())
+      if (!trainer && pokemon.isShiny())
         this.gameStats.shinyPokemonSeen++;
     }
   }