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?
| Directing | Kunihiko Yuyama | Director |
| Crew | Junichi Masuda | Creator |
| Directing | Masakatsu Iijima | Assistant Director |
| Visual Effects | Kyouko Takeuchi | Animation Director |
| Production | Tsunekazu Ishihara | Production Supervisor |
| Visual Effects | Yōichi Kotabe | Animation Supervisor |
| Crew | Satoshi Tajiri | Creator |
| Production | Mitomu Asai | Executive Producer |
| Visual Effects | Sayuri Ichiishi | Animation Director |
| Directing | Norihiko Sudo | Assistant Director |
| Writing | Yuji Asada | Storyboard |
| Sound | Masafumi Mima | Sound Director |
| Writing | Atsuhiro Tomioka | Screenplay |
| Visual Effects | Sayuri Ichiishi | Character Designer |
| Crew | Ken Sugimori | Creator |
| Production | Masakazu Kubo | Production Supervisor |
| Production | Susumu Fukunaga | Executive Producer |
| Visual Effects | Ryo Sato | Animation Director |
