There's 1 Nihilego, 2 Buzzwole (Sun)/4 Pheromosa (Moon), 2 Xurkitree, 4 Kartana (Sun)/2 Celesteela (Moon), 1 Guzzlord. As far as personal experience goes, they come with 3 IVs guaranteed (like legendaries), and the others are random. I didn't use a Synchronizer until Celesteela, but even then it took 5 tries to get the desired nature and more for good IVs (I think I might have gotten the desired nature 3 times out of 12 tries?) So I guess it does help, but soft reset is your friend.Will I only be able to battle each Ultra Beast once per game? If so, does that mean I should stock up on Synchronizers? Also, do they come with good IV's?
Edited to correct mistakes
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