The real draw here is watching every legendary Pokémon you've ever cared about show up and fight on screen at once. The plot gets you there by basically kidnapping the characters, but once the summons start, the movie stops pretending to have a story and just commits to the spectacle. It's a parade of animation budget spent on things colliding with other things, which is exactly what a Pokémon movie should do.
Ash and his traveling companions stumble into a seaside desert city where they encounter Hoopa, a Mythical Pokémon with an extraordinary power: the ability to pull anything through magical rings, from objects to people to other Pokémon. What begins as curious encounters with Hoopa's summoning ability quickly turns ominous when they learn the dark history behind the Pokémon's existence. Centuries ago, a massive and destructive force was sealed away by a legendary hero, and Hoopa has been unknowingly bound to that same curse ever since. As the seal weakens, Ash realizes that Hoopa isn't just a quirky friend with cool powers. The Pokémon is struggling against something far more sinister living inside it. If the ancient threat breaks free, the entire region could be devastated. Ash must decide whether he can help Hoopa overcome the darkness within before a forgotten legend returns to wreak havoc. It's a high-stakes adventure that blends light-hearted discovery with genuine danger and the question of whether friendship can overcome even the darkest forces.