Pokémon The Series: Sun & Moon

Twirling with a Bang! (21x34)

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Ash and the gang are watching a fireworks display when a mysterious Pokémon appears and begins its own fireworks performance, to everyone's delight (especially Poipole). Just as its performance ends, a wormhole opens and an Ultra Beast appears. The next day, the Ultra Guardians are summoned, and Lusamine briefs them on the first stranger, an Ultra Beast designated Blacephalon. Suddenly the power goes off; when the Ultra Guardians arrive at the power sub-station where the drain is coming from, they find the trouble is being caused by the second Ultra Beast, designated Xurkitree, which attacks them. Blacephalon appears and the two Ultra Beasts begin battling. Because the fighting styles look like performances, Ash comes up with an unusual plan: to combine all their Pokémon's attacks into one fireworks performance! With the Ultra Beasts distracted, Ash unleashes Lycanroc's new Z-move Splintered Stormshards and both Ultra Beasts are weakened enough to be captured. The next day, worm holes are opened and the two Ultra Beasts return home.