Ash and his friends have never backed down from a fight, and they know that sometimes the smallest things can make the biggest difference! They meet the feisty and sharp-witted Mythical Pokémon Shaymin, who crosses into the Reverse World while attempting to reunite with its friends. This realm is ruled by the Legendary Pokémon Giratina, who does not suffer intruders lightly. Add to the mix a helpful researcher, a dangerous villain who wishes to control Giratina, and a plan to rule the world, and you have all the makings of a Pokémon epic!