https://www.polygon.com/2017/10/12/16464038/pokemon-ultra-sun-and-ultra-moon-z-moves-necrozma-legendary-pokemon

In Pokémon Ultra Sun and Ultra Moon, ultra-strong legendary monster Necrozma gets some fancy, familiar new forms. The upcoming Nintendo 3DS games’ latest trailers introduce two versions of the Pokémon, which look a lot last year’s starring pair of legendary Pokémon.

Ultra Sun and Ultra Moon feature Dusk Mane Necrozma and Dawn Wings Necrozma, respectively. Both Pokémon appear to be a combination of the eponymous monster and Solgaleo and Lunala, who we know from Pokémon Sun and Pokémon Moon. These forms of Necrozma even have the same typing as Solgaleo and Lunala, so consider these to be some souped-up takes on Sun and Moon’s most recognizable legendaries.