Yes. To a degree.
Ordering for UBs
Sun is Nihilego -> 2x Buzzwole -> 2x Xurkitree -> 4x Kartana -> Guzzlord
Moon is Nihilego -> 4x Pheromosa -> 2x Xurkitree -> 2x Celesteela -> Guzzlord
I think that's correct from what I have found out. I'm currently at my second Xurkitree on Sun.
Can confirm this is correct. Caught them all in Sun, on Celesteela in Moon. Personally I'd have liked if it was 3 Buzzwole, 3 Kartana and 3 Pheromosa, 3 Celesteela. Kartana and Pheromosa don't have that many different sorts of sets.
My question right now is: is it worth using my Master Ball trying to get a Tapu Lele with HP Fire and then just trying my luck to get HP Ice or Fire on Tapu Koko? It'd majorly expedite the process, and I feel like Lele needs a good HP type more than Koko does.
Edit: Also, is there anywhere to discuss thoughts on what the next game might be? I almost feel like a Gen I remake could be just as possible as Gen IV, because Sun and Moon have certainly touched on both a good deal.