Ash, Goh, and Chloe visit the frigid mountains of the Crown Tundra to investigate a report of an unusual Pokémon. Coincidentally, Lillie and Gladion are there, too, still searching for their missing father, Mohn. Along with Lusamine, they press on and find Mohn living in a cabin, but he has amnesia and doesn’t recognize them. It turns out he’s been living with a Nihilego who he believes to be his human daughter. Worried that Mohn would send it away, Nihilego did everything possible to keep him from remembering his previous life. But his memory finally returns, and the happy family asks Nihilego to join them!