Pikachu Are mouse-like creatures, and were the first "Electric-type" Pokémon created, their design intended to revolve around the concept of electricity. They appear as mouse-like creatures that have short, yellow fur with brown markings covering their backs and parts of their lightning bolt shaped tails. They have black-tipped, pointed ears and red circles on their cheeks, which can spark with electricity. In Pokémon Diamond and Pearl, gender differences were introduced; a female Pikachu now has an indent at the end of its tail, giving it a heart-shaped appearance. They attack primarily by projecting electricity from their bodies at their targets. Within the context of the franchise, a Pikachu can transform, or "evolve" into a Raichu when exposed to a "Thunderstone". In later titles an evolutionary predecessor was introduced named "Pichu", which evolves into a Pikachu after establishing a close friendship with its trainer.