Ash meets the Mythical Pokémon Volcanion when it crashes down from the sky, creating a cloud of dust-and a mysterious force binds the two of them together! Volcanion despises humans and tries to get away, but it's forced to drag Ash along as it continues its rescue mission. They arrive in a city of cogs and gears, where a corrupt official has stolen the ultimate invention: the Artificial Pokémon Magearna, created 500 years ago. He plans to use its mysterious power to take control of this mechanical kingdom! Can Ash and Volcanion work together to rescue Magearna? One of the greatest battles in Pokémon history is about to unfold!

When Diancie a Pokémon said to create diamond travels to find Xerneas to help her make a heart diamond to save her home, Ash, Serena, Clemont and Bonnie help her to be safe on the way from thieves.