In Japan, there is no distinction between Pokémon the Series: Sun & Moon, Pokémon the Series: Sun & Moon—Ultra Adventures, and Pokémon the Series: Sun & Moon—Ultra Legends.
The previous Pokémon anime series, Pokémon the Series: Sun & Moon—Ultra Adventures, premiered its regular weekly run in the U.S. on Disney XD in March 2018.
Pokémon the Series: Sun & Moon similarly premiered in May 2017.
The Pokémon Sun & Moon anime series premiered on TV Tokyo and its affiliated stations in Japan in November 2016.