Pokémon the Series: Sun & Moon Episode 140: Z-Move Showdown!
Episode 140 of 146 of Pokémon the Series: Sun & Moon, aired September 22, 2019, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Just as the Champion of the Alola Pokémon League is crowned, an Ultra Wormhole opens above the stadium, and an angry Guzzlord appears.