Who's your best Pokémon?

I haven't really played the game since Mega Mewtwo X, so I'm out of date. I've kept up with updates, though, just haven't played the new characters. However, based on my experience in the game, my best Pokémon was Pikachu. I played more games as it then any other Pokémon and it had my highest win rate. What about y'all?