Whistle

-And who grew up here?- You heard a familiar voice behind you that you weren't expecting at the moment. Indeed, first person you met after returning to Pallet Town was your childhood friend and your biggest rival. Green Oak.

You haven't seen each other for years, but there was a constant cocky smile and self-confidence on his face. Well, after all, he was once a champion - until you shamelessly took that title away from him.