Cyrus has succeeded in his goal of awakening Dialga and Palkia and now the entire Sinnoh region is in danger. Cyrus plans to rebuild the world in his image, but that means the destruction of everything. Can Ash, Dawn, Brock, Looker, and Cynthia stop Team Galactic and save Sinnoh?

While on the way to Sunyshore City, Ash and friends meet a master of air battles. Hoping to improve Gliscor's flying, Ash decides to have a battle with him, and the results may be more than he expected.