Based on Nintendo DS game; Pok&eacute;mon Mystery Dungeon 2: Time &amp; Darkness. 
(Source: AniDB)

The Pok&eacute;dans team's adventure begins one day when a boy, who has transformed from a human into a Pocchama (Piplup) creature in the world where Pok&eacute;mon 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)

The manga is based on the Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness games.
 
The story revolves around Honō, an amnesiac human who wakes up as a Chimchar. He meets a cowardly Totodile, and together, they form Team Blaze. 
 
(Source: Bulbapedia)

After defeating Brandon and declining the offer to be a Frontier Brain, Ash sets off to travel through the far away land of Sinnoh. Once he gets there, he meets up with Hikari, a local trainer from the region, and they decide to travel together.

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