Quick recap
In Dahara City, Ash, Serena, Clemont and Bonnie meet Hoopa, a mischievous Pokémon that can pull anything through its rings. Siblings Baraz and Meray explain that centuries ago Hoopa's true form terrorized the land until it was sealed in a bottle. When the bottle is opened, a shadow escapes and tries to take over Hoopa, which shifts into its Unbound form and starts summoning legendaries for a massive battle, with Ash caught in the middle. The shadow even possesses Ash. Hoopa faces its own rage, remembers its friendship with Baraz and Meray, and breaks free. The group escapes through a ring, and Hoopa stays behind to rebuild the tower.
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