Pikachu is an Electric-type Pokémon introduced in Generation I. Pikachu is famous for being the most well-known and recognizable Pokémon. Over the years, Pikachu has become so popular that it serves as the Pokémon franchise mascot. It is the Version Mascot for the game Pokémon Yellow. It is also well known from the anime, where Ash Ketchum, the protagonist, owns a Pikachu. It evolves from Pichu when leveled up with high friendship and evolves into Raichu when exposed to a Thunder Stone.