Pokemon Fushigi no Dungeon: Toki no Tankentai, Yami no Tankentai

In a world inhabited only by Pokémon, a timid Chimchar dreams of joining Wigglytuff's Guild and becoming an explorer. His latest attempt ends with him finding an unconscious Piplup, who wakes in shock: although his body is now that of a Pokémon, he remembers that he used to be human.

Wigglytuff cannot explain the transformation, but he gives the pair a path forward by forming them into a new exploration team. For their first assignment, Piplup and Chimchar head into Labyrinth Cave with Sunflora to obtain a Gabite Scale, beginning a journey that may also reveal why a human became a Pokémon.