Throughout development of Red and Green, all Pokémon were designed by Ken Sugimori, a long-time friend of Tajiri, and a team of fewer than ten people, including Atsuko Nishida who is credited as the designer of Pikachu.
Sepanjang pengembangan Red dan Green, seluruh Pokémon dirancang oleh Ken Sugimori, teman lama Tajiri, dan sebuah tim kurang dari sepuluh orang, termasuk Atsuko Nishida yang disebut-sebut sebagai perancang Pikachu.