Xurkitree

Xurkitree is a species of Pokémon in the series of the same name. It is a Electric Pokémon introduced in the seventh generation in Pokémon Sun. It is an Ultra Beast with the code name as UB-03 Lighting (UB03 Lightning in Japan).

Main Pokémon games
In the post-game Ultra Beast quest in Sun and Moon, Xurkitree is the third Ultra Beast that has to be hunted down. It's on Akala Island.