- Country: Japan
- Genres: Adventure, Animation, Short
- Release: 2015-02-02
- Director: Kunihiko Yuyama
- Writers: Satoshi Tajiri , Junichi Masuda , Ken Sugimori , Atsuhiro Tomioka
- Language: Japanese | English
- Stars: Ikue Otani , Megumi Satou , Yuji Ueda , Yuji Ueda , Megumi Hayashibara , Hitomi Nabatame , Shin-ichiro Miki , Inuko Inuyama , Kenta Miyake , Rikako Aikawa , Chika Anzai , Chika Anzai
- Runtime: 22 min
- Awards: N/A
- AKA: Pokémon: Pikachu, What's This Key? , Pikachu, What's This Key? (United States of America) , Pikachû, kore nan no kagi? , Пікачу, що це за ключ? (Ukraine) , Pikachu, kore nan no kagi? , Pokémon: Pikachu, What's This Key? (United Kingdom) , Pikachu, O Que é essa Chave? (Brazil) , ピカチュウ、これなんのカギ? (Japan) , Pikachu, che chiave è questa? (Italy)
- Plot:
Appearing before Pikachu and friends is the keyring Pokemon, Klefki. Inserting a mysteriously shaped key into the keyhole floating in the air, a very mysterious portal appears! Klefki has the key to go to various worlds. What kind of world will the key that Pikachu holds lead to?
- IMDB:tt4422136
Pikachu, What’s This Key? Cast · · · ALL
Kunihiko Yuyama
Director
Ikue Otani
Pikachu (voice)
Megumi Satou
Dedenne (voice)
Yuji Ueda
Keromatsu / Sonans (voice)
Megumi Hayashibara
Fokko (voice)
Hitomi Nabatame
Harimaron (voice)
Shin-ichiro Miki
Luchabull (voice)
Inuko Inuyama
Nyarth (voice)
Kenta Miyake
Maaiika (voice)
Rikako Aikawa
Cleffy (voice)
Chika Anzai
Victini / Amarus (voice)
Kiyotaka Furushima
Chigoras (voice)
Yuka Terasaki
Onbat (voice)
Tomoko Kaneda
Jirachi (voice)
Chinatsu Akasaki
Shishiko (voice)
Rica Matsumoto
Satoshi (voice)
Mayuki Makiguchi
Serena (voice)
Yuki Kaji
Citron (voice)
Mariya Ise
Eureka / Manaphy (voice)
Mayu Watanabe
Narrator (voice)