Pikachu

Pikachu is the Pokemon mascot. He'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's going to appear again in Super Smash Bros. Brawl.

Trivia

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