Ordinary Pikachu can Gigantamax into Gigantamax Pikachu if it has the Gigantamax Factor. Pikachu has sixteen other forms that fall into four groups: Cosplay Pikachu, Pikachu in a cap, the partner Pikachu, and Gigantamax Pikachu. In Alola, Pikachu evolves into Alolan Raichu when exposed to a Thunder Stone. It evolves from Pichu when leveled up with high friendship and evolves into Raichu when exposed to a Thunder Stone. Pikachu ( Japanese: ピカチュウ Pikachu) is an Electric-type Pokémon introduced in Generation I. Pokémon Brilliant Diamond and Shining Pearlīreeding Egg Groups Field and Fairy or No Eggs Discovered Cosplay/ Cap.