It doesn't work on Solgaleo or Lunala, both of whom we do know are Ultra Beasts. If I had to guess, I'd say the three of them fall into a position where they're Ultra Beasts by lore, but not by internal coding.
That being said, I doubt Necrozma is UB-00. UB-0X is a human-given designation, and I doubt they've given one to Necrozma.
The way I see it is that the Solgaleo/Lunala lineages plus Necrozma ARE Ultra Beasts- but they have existed for so long in this world that they have adapted and evolved to the Normal world/dimensions environment. The library books you can read on the legendary beasts in Malie mention a war that occurs between and pokemon described as the two beasts AND Necrozma.
Initially it describes the mascot- but then on the third page of the book on the table it says this:
"Then did the beast that brings the dark,
Cast it's pall on the line of Kings.
So would the beast that had won
mark the path for all such finished things."
The keyword 'Pall' is a term for a shroud or funeral veil over a tomb/coffin. Matches nicely to Necrozma's apparent name. Both Lunala and Solgaleo were described as "emissaries of light" in the prerelease info as well- cosmog is also noted to absorb light for apparant sustenance as well. Which makes me think that Solgaleo and Lunala's purpose is to actually collect light from this world and deliver it to Ultra Space in order to sustain some or all of it's inhabitants there. Particalarly Necrozma- being the Prism Pokemon.
For the war that occured in the stories- I think the truth to it hasn't been explained yet- in that Necrozma may have intended to wipe out life after emerging from it's original wormhole (due to it's vicious disposition mentioned) by devouring the light of this world. The texts in the library state that the beasts of the Sun and Moon battled the tapus's to a standstill, before bestowing with powers untold- which makes me theorize that the Cosmogs/Solgaleo/Lunala's of the time took pity on life on this world after Necrozma's arrival- and actually helped pokemon and humanity to either A) Defeat Necrozma or B) Rekindle Light to sustain life after Necrozma's attack. Both could be possible. As the text's on the library shelves aren't exactly clear on the gifts that the Light Beasts bestowed upon humanity.
I think Solgaleo/Lunala are imagined to have stay present in this world following that war- adapting slowly and explaining the lack of effectiveness of the Beast Ball. Same goes for Necrozma- it it was defeated and lay dormant on this planet I assume it's body/energy would have adapted to the "Real World" and lost much of it's affinity to Ultra Space
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