Pikachu

Pikachu is the Pokemon mascot. It's number 25 of the Pokemon and a notable owner is Ash Ketchum. Pikachu has appeared in the Super Smash Bros. series and will probably always will, for the time being. He has already been revealed as a character in Super Smash Bros. Brawl.

Trivia

 * In Wario Land 3 Wario collects a treasure called Pokémon Pikachu.