Pichu is playable character in the fighting video game, M.U.G.E.N Trilogy. It was confirmed along with the other characters from Super Smash Bros. Melee on February 1, 2015. Satomi Kōrogi provides the role for Pichu in this fighting video game.
Pichu is a small, rodent-like Pokémon, and is categorized within the Pokédex at #172 as the "Tiny Mouse Pokémon". As the pre-evolved form of Pikachu and a baby Pokémon, Pichu is less powerful than its evolved forms. While it cannot learn some moves that Pikachu and Raichu can, it can learn three moves (Charm, Sweet Kiss and Nasty Plot) that its evolved forms cannot. Pichu only evolves into Pikachu when it achieves a very high level of friendship with its Trainer.
The Pokédex explains that the electricity pouches in Pichu's cheeks are still small and unable to store much electricity. This, in turn, makes it inexperienced with handling electrical attacks, to the point that it occasionally inflicts damage to itself. While this does not actually occur in the Pokémon games outside of two instances, it has nevertheless been demonstrated in both the Pokémon anime and the Super Smash Bros.
How to Unlock
Use Pichu's Super Smash Bros. amiibo or scan Pichu's AR Icon from the M.U.G.E.N Trilogy website.