Can create Ultranecrozium Z held items for the player's Pokémon.
Held item
This move effect may be in need of research. Reason:Can a Pokémon other than Necrozma that is transformed into an Ultra Necrozma use the Z-Move Light That Burns the Sky even if it does not hold an Ultranecrozium Z? You can discuss this on the talk page.
A Pokémon transformed into Ultra Necrozma cannot use any other Z-Move than Light that Burns the Sky, even if holding the appropriate Z-Crystal.
Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot remove a Z-Crystal from a Pokémon.
An image of an Ultranecrozium Z appeared in Transcend!! Ultra Necrozma!, where it was revealed to have been one of the aura-related items collected and researched by the Ultra Recon Squad. When held by Dulse, it had caused him to get drawn to Necrozma, who absorbed the item and used it to transform into Ultra Necrozma.