Pichu

Pichu is an Electric-type Pokémon from the Pokémon franchise. It is a Baby Pokémon that was first introduced in Gen. II and is the pre-evolution of Pikachu and Raichu. Pichu evolves into Pikachu when it levels up while having a strong friendship with its Trainer. Pikachu evolves into Raichu when exposed to a Thunder Stone in the Kanto, Johto, Hoenn, Sinnoh, Unova, and Kalos regions, but evolves into Alolan Raichu when exposed to a Thunder Stone in the Alola region. In the Johto region, Pichu's region of origin, its Pokédex number is #021, #162 in Omega Ruby and Alpha Sapphire's Hoenn Pokédex, #155 in the original Hoenn Dex, #103 in Sinnoh, #035 in Central Kalos, #024 in Alola, and #172 in the National Dex. Pichu also appears in Super Smash Bros. Melee as a playable character. It is similar to Pikachu, but receives recoil damage upon using electric moves as it is not mature enough to store the electricity in its sac-like cheeks and control it, as stated by numerous Pokédex entries. Pichu also has a number of different forms, including Ukulele Pichu, and Spiky-eared Pichu.