Pokémon Diamond and Pearl Adventure!, Vol. 2

Hareta and his partner Piplup grow stronger as they travel through Sinnoh, clashing with Team Galactic along the way. In Celestic Town they find the first real clue to Dialga's whereabouts, only to discover that Team Galactic's boss, Cyrus, got there first. Determined to improve, Hareta trains under Canalave City's tough Gym Leader, Byron — but passing his test at the Fortress of Steel won't be easy.