In the Forest of Okoya, Koko is a feral child who has been raised as a Pokémon by the Mythical Pokémon Zarude. Koko has grown up never doubting that he is a Pokémon even though he can't really use any sort of moves. Ash Ketchum and Pikachu meet Koko and help him protect the Great Tree from the crooked scientist Dr. Zed.

• TOHO
• Pikachu Project
• Rica Matsumoto
• Ikue Otani
• Moka Kamishiraishi
• Megumi Hayashibara
• Shin-ichiro Miki
• Inuko Inuyama
• Kantarô Nakamura
• Shoko Nakagawa