Pokémon Diamond and Pearl Adventure!, Vol. 1

Hareta has spent his whole life in the wild, raised by Pokémon — he can climb like an Aipom, swim like a Magikarp, and even eat bark like a Bidoof. Recruited by Professor Rowan, he sets off with his first Pokémon partner, Piplup, and his new friend Mitsumi to search for the legendary Pokémon Dialga. But Team Galactic is hunting for Dialga too, and their scheme threatens to bring disaster to the Sinnoh region.