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

An Evolution Solution: Necrozma, Dusk Mane, Dawn Wings, or Ultra?

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

Pokémon Ultra Sun and Ultra Moon Steelbook Dual Pack - Nintendo 3DS : Video Games

Ultra Necrozma

Battle! Dusk Mane/Dawn Wings Necrozma (Extended) - Pokemon Ultra Sun & Ultra Moon

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🤩Ultra - Crazy Monster/Monster Saga/Adventure of Masters

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

Necrozma - Evolutions, Location, and Learnset, Crown Tundra DLC