Hareta, a boy raised in the wild by Pokemon, gathers his friends to thwart Team Galactic's plans to capture Dialga--a scheme that, if successful, could prove disastrous for the land of Sinnoh.

"As they journey through the land of Sinnoh, Hareta and his partner Piplup grow stronger every day--while ruining Team Galactic's schemes and getting into plenty of Pokemon battles along the way!"--Cover.

Hareta and Koya fight! And then they fight in the tournament to determine the best trainer in Sinnoh! Which of Hareta's Pokémon will evolve during the heated battle? Who is that mysterious man in the stands cheering Hareta on? And why is Koya talking to ... his briefcase?!

"Hareta and his friends take on Team Galactic! But they've walked right into a trap! Hareta, together with several of Sinnoh's Gym Leaders, launch their attack on Team Galactic's headquarters (after a short break for some lunch)! Things go wrong quickly, and one by one, Hareta's friends are captured. Hareta pushes deeper into the enemy lair, only to come face-to-face with Mitsumi, who has now joined Team Galactic! The two friends and their Pokémon...