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It's probably Guzzlord's home. Episode description doesn't mention anything about Ultra Beasts but it's a two-parter:
>Big news for Pocket Monsters Sun & Moon! Incredibly enough, the mythical Pokémon Zeraora is going to appear! Zeraora uses super powerful electric moves; What kind of prowess is it going to demonstrate? What?! Zeraora and Pikachu will have a fully powered battle?! Which of them will win? And believe it or not, we'll also give out Zeraora merchandise for 4 weeks straight! Details will be announced during the episodes! Zeraora will be appearing on December 9th and December 16th!
so I imagine it ends with a Guzzlord interrupting their fight, Ash and Alolan Tobias team up to beat it in the next episode, they both end up in Ash's world, and at the end of Gen 7 he wrecks Ash at the Alola League.
