Pichu

Pichu is an Electric type Pokemon introduced in Generation II. Outside of Pokemon, Pichu was a Super Smash Bros. playable character in one game of the series, in Super Smash Bros. Melee.

It evolves into Pikachu when levelled up with high friendship and later evolves into Raichu when exposed to a Thunder Stone.

Trivia

 * Pichu's evolution Pikachu was also playable in Super Smash Bros. Melee.