Pichu

Pichu is a Pokémon introduced in the games Pokémon Gold, Silver and Crystal. It is the pre-evolved form of Pikachu, the Pokémon mascot. The Pichu that appeared in Super Smash Bros. Melee is male, like his evolved counterpart, Pikachu.

Super Smash Bros. Melee
Pichu was a playable fighter in Super Smash Bros. Melee. He was an unlockable character, unlocked by beating Event Match 37: Legendary Pokémon. After beating him, Pichu will appear to challenge the player and, if defeated, will become a playable fighter.

Pichu has a very similar moveset to Pikachu. However, Pichu is a less convenient character, as he is the lightest and he is easily thrown off the board. Also, all of his electric attacks (including Skull Bash) causes damage to himself. However, due to his small size, and quick nature, he is usually good for fighting larger enemies, whose attacks hit high in the air. Also, he packs more power than Pikachu, namely because the Pichu species in general have a hard time storing their electricity. Therefore, more power is released and they hurt themselves.

As such, Pichu will usually cause a lot of losses to the player when they first play as him, but with practice, he can become a dangerous mouse. Additionally, Pichu has two taunts, one for each direction he's facing. In the game, Pichu was voiced by Satomi Koorogi in both English and Japanese, who does his voice in the Pokémon anime.

Trophy Information from Super Smash Bros. Brawl
''A Tiny Mouse Pokémon. Because its electric cheek pouches are still small, it cannot store electricity yet. Pichu has been known to flaunt its courage by touching tails with others and setting off sparks. It is easier for Pichu to build up electricity when the humidity is lower. Pichu will evolve into Pikachu.''