Sealed inside a Prison Bottle a century ago for wreaking havoc, the Mythical Pokémon Hoopa is loose again by the time Ash Ketchum and his friends reach the seaside Dahara City. Hoopa's confined form, gentle and eager to please its caretakers Baraz and Meray, loses control of its own power, releasing a rampaging Unbound form that summons legendary Pokémon from across the world to fight. Ash and his companions must help rein in Hoopa's unleashed strength before Dahara City is destroyed. This is the 18th Pokémon feature film, the second in the XY series.