In this new film adventure, Ash encounters the Mysterious Pokémon Volcanion, which suddenly falls from the sky and raises a huge cloud of dust. Ash is connected to the Mysterious Pokémon Volcanion by a miraculous power. Unable to get rid of Ash, the Pokémon continues its journey to a city full of gears. There also resides a corrupt minister who has stolen an invention that can be used to create the fabricated Pokémon Magearna, which was created 500 years ago. With the help of Magearna's power, this minister wants to take over the fully mechanical kingdom Ash has landed in. Now the question is whether Ash and Volcanion can pull themselves together to save Magearna. One of the most powerful battles in Pokémon history breaks out.