Pikachu, What's This Key? (Japanese: ピカチュウ、これなんのカギ？ Pikachu, What's This Key For?) is the Pikachu short that debuted alongside Pokémon the Movie: Diancie and the Cocoon of Destruction.
Pikachu and his friends meet Klefki, the Keyring Pokémon. It takes them to its magical world where they explore the realms of the mystical Pokémon that live there.
- Ash Ketchum (face never shown)
- Serena (face never shown)
- Bonnie (face never shown)
- Clemont (face never shown)
- Pikachu (Ash's)
- Froakie (Ash's)
- Hawlucha (Ash's)
- Fennekin (Serena's)
- Dedenne (Clemont's)
- Chespin (Clemont's)
- Meowth (Team Rocket)
- Wobbuffet (Jessie's)
- Inkay (James')
- This is the first Pikachu short since Gotta Dance!! to feature humans.
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