Edit) how is dusk mane/dawn wing necrozma an ultra beast?

Pokemon Ultra Sun & Moon feature intros Dusk Mane and Dawn Wings Necrozma, two new Ultra Beasts, pre-order bonuses and more

Dusk Mane and Dawn Wing Necrozma on NebbyFans - DeviantArt

How To Get Necrozma Into Pokémon Sword & Shield

Ultra Necrozma

Pokemon Ultra Sun & Moon: How To Get Ultra Necrozma

Edit) how is dusk mane/dawn wing necrozma an ultra beast?

Pokémon Ultra Sun & Ultra Moon - Pokémon Forms

Foreword - Preface - Introduction, Pokémon: Ultra Sun & Moon

Who Should the Rest of the Gen 7 Legends (and extra forms+Mythicals+Ultra Beasts) go to when they arrive on Pasio? : r/PokemonMasters