https://www.gamespot.com/articles/pokemon-ultra-sun-and-moon-let-you-use-two-z-moves/1100-6454011/

Nintendo has released a new trailer for Pokemon Ultra Sun and Ultra Moon. The video showcases a pair of powerful new Z-Moves that Necrozma can use in its Dusk Mane and Dawn Wings forms, as well as a few handy new features that have been added to your Pokedex for this adventure.

When either Solgaleo or Dusk Mane Necrozma hold Solganium Z, they can unleash the new Steel-type Z-Move Searing Sunraze Smash. If Lunala or Dawn Wings Necrozma are equipped with Lunalium Z, they can use the Ghost-type Z-Move Menacing Moonraze Maelstrom. Necrozma itself can also learn a new move called Photo Geyser, a powerful Psychic-type attack exclusive to the Prism Pokemon. You can see screenshots of the new moves below.