The N-Solarizer (Japanese: ネクロプラスソル Necro Plus Sol) is a Key Item introduced in Pokémon Ultra Sun and Ultra Moon. It can be used on Necrozma to fuse it with Solgaleo into Dusk Mane Necrozma or to separate Dusk Mane Necrozma into its constituent Pokémon.
It was developed by Colress on behalf of the Ultra Recon Squad as the Colress Machine No. 1198 (Japanese: アクロママシーン １１９８号 Achroma Machine No. 1198).
While the player does not have a Dusk Mane Necrozma, the N-Solarizer can be used to fuse Necrozma with Solgaleo to become Dusk Mane Necrozma.
While the player has a Dusk Mane Necrozma, the N-Solarizer be used to separate it into Necrozma and Solgaleo. All properties of the Solgaleo will be retained.
Colress Machine No. 1198