From Bulbanews, your community Pokémon newspaper.
Post-launch trailer released
The Pokémon Company has officially promoted Ultra Necrozma (and its exclusive Z-Move) and Naganadel for the first time. These were all introduced in Pokémon Ultra Sun and Ultra Moon, which was released on November 17, 2017. While the information that was revealed could already be experienced in Pokémon Ultra Sun and Ultra Moon, this is the first release of the standard official artwork for these Pokémon.
Ultra Necrozma is a new form of Necrozma introduced in Pokémon Ultra Sun and Ultra Moon. It is Psychic/Dragon-type and has the unique Ability Neuroforce, which increases the power of moves which would be super effective. Necrozma can change into this form by performing an Ultra Burst, which requires it to hold an Ultranecrozium Z. It has the exclusive Z-Move Light That Burns the Sky, which it can use if it knows Photon Geyser.
The Ultra Beast Naganadel, codenamed UB Stinger, is the evolved form of Poipole, both of which were introduced in Pokémon Ultra Sun and Ultra Moon. It is Poison-type and has the Ability Beast Boost.