Due to the disastrous battle between Dialga and Palkia in Alamos Town, the Reverse World, where the legendary Giratina lives, has become more corrupted than usual. Dark and ominous clouds have appeared which enrages Giratina. As a form of revenge, Giratina tries to lure Dialga into its world. Meanwhile, the small, but legendary Shaymin appears before Ash and friends and guides them to the flower paradise of Gracidea, but what is its intention? There’s also the villain Zero on the loose who wants to control Giratina and use it for his evil plan.