Pichu is the pre-evolved form of Pikachu. It is a small yellow electric mouse, but is not as powerful as Pikachu. It evolves to Pikachu when it is very happy, such as loving its trainer. There are special forms of Pichu: a notched-ear Pichu, and a Pikachu-colored Pichu as event Pokémon in the "Pokémon HeartGold and SoulSilver" games. Pichu has appeared as an unlockable character in "Super Smash Bros. Melee" and "Super Smash Bros. Ultimate" where it has a cloned moveset to Pikachu's but takes damage when it uses electric attacks. Pichu features in the intro of the third Pokémon movie.