Go and Sonia learn a new detail about the hero legend! Meanwhile, a massive shockwave blasts out from Knuckle City alongside red light! The legendary Pokémon Mugendaina finally makes its appearance! What will you do now, Satoshi?!
Go and Sonia are on their way to the ruins in Lateral Town to solve the mystery of the hero legend when they are attacked by a group of suspicious-looking men. A Daimax battle breaks out, and the shock from it causes a mural to collapse, leading to them discovering a stone statue of a certain Pokémon behind it. Go calls Satoshi and tells him the new detail they just learned about the hero legend, but at that moment a massive shockwave blasts out from Knuckle City alongside red light! The legendary Pokémon Mugendaina, who had been operating behind the scenes and whom Rose is attempting to bring back, has finally leaped out!!