Pokémon The Series: Sun & Moon

A Dream Encounter! (21x1)

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Ash has a dream in which he and Pikachu enter an ancient temple and encounter two mysterious Pokémon. Ash makes a promise to them, after which another Pokemon appears. The next morning, he, Pikachu and Rotom-Dex are led by Tapu Koko to a spot in the forest where they find a sleeping Cosmog, a Pokémon that Rotom cannot identify but which Ash recognizes from his dream. Ash takes it to the Pokémon school, with both interesting and unfortunate results. Ash decides to care for the Cosmog and Lillie names it "Nebby". Lillie's mother Lusamine, the President of the Aether Foundation, re-enters her daughter's life with her associates Professor Burnet, Faba and Wicke, but Lillie is not happy to see her. Lusamine and the Aether Foundation have a powerful interest in the temple from Ash's dream and what they call Ultra Beasts. They are shocked when Ash tells them about his dream, and Lusamine asks Ash to let Aether look after Nebby, who may be an Ultra Beast. Ash turns down the offer, saying he will keep his promise to look after Nebby. Lusamine accepts his decision, but Faba is not pleased.