The graphic novel tie-in to the latest Pokemon movie! Hidden deep in a secret jungle, far from any humans, there is a Pokemon paradise-beautiful and peaceful, but governed by strict rules. Ten years ago, the Mythical Pokemon Zarude found the abandoned baby Koko and decided to break the rules, raising him as its own child. Since then, Koko has been isolated from other humans...until now.

In a desert city by the sea, Ash, Pikachu, and their friends meet the Mythical Pokémon Hoopa, who can summon all sorts of things - including people and Pokémon - through its magic rings. The little Mischief Pokémon likes to use this talent to play harmless tricks on people…but when its true power is released, it loses control and becomes the towering and terrifying Hoopa Unbound! Long ago, a brave hero stopped its rampage by confining its power in a special bottle. Now that the bottle has been rediscovered, Hoopa must confront its greatest fear! Can Ash help his new friend overcome the darkness within—or will this dangerous struggle erupt into a clash of legends?

Ash meets the Mythical Pokemon 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 minister has stolen the ultimate invention: the Artificial Pokemon 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 Pokemon history is about to unfold!