Oh, right. Could not think of any chokepoints. Forgot about Ultra Necrozma.
Setup: Tried a blind Nuzlocke of Ultra Sun. (Played Moon.) Never attempted a Nuzlocke before. Adhered to a level limit. Set it based on the trials. (Found a no-spoiler list.) Failed at Guzma. Kept that team and the level limit, however. Preserves some kind of challenge.
Defeated the level 49 Kommo-o trial. Probably hit level 50 then. What is next? Level 60 Dusk Mane Necrozma. Acted dumb, though. No issue.
Flew through the wormhole. Stood no chance with a level 50 team against an angry level 60 legendary with stat boosts. One-shot and outsped the whole team.
Saw nowhere good to grind. Looked up a way around the problem. Savescummed until Focus Band/affection saved Crobat. Whittled it down with Toxic and Protect. (Might have gotten a Haze in too.)