I really want to hunt at least one of those. Can someone please leave a list in the answers or comments on who are shiny locked? Also including the legendaries from the Ultra Wormhole, the Tapu guardians, and the Ultra Beasts. I know that Solgaleo, Lunala and Necrozma are locked but I still wonder who you can hunt and who not.
The following Pokémon are shiny locked in Ultra Sun and Ultra Moon:
All of the other legendaries and ultra beasts can be shiny hunted.
Source: knowledge as a shiny hunter. Though if you want a credible source, here's this link: https://www.serebii.net/games/shiny.shtml it tells you what is locked in what games at the bottom of the page.