Pokémon Mystery Dungeon: Explorers of Sky—Beyond Time and Darkness(2009)

Pokémon Fushigi no Dungeon: Sora no Tankentai - Toki to Yami wo Meguru Saigo no Bouken

The Pokédans team's adventure begins one day when a boy, who has transformed from a human into a Pocchama (Piplup) creature in the world where Pokémon live, meets a Hikozaru (Chimchar) creature. The team joins a Juptile (Grovyle) and go to the "Lost Continent" to save the world with the "Time Gears."

(Source: Anime News Network)