Good news is that Pokemon Masters gives us evidence that regular Sun/Moon is cannon, not the Ultra crap. Bad news is that Pokemon Masters is still not a very good game.
Not necessarily with Hoopa running the show. If the Cyrus event didn't imply that he's from a timeline where he won, I'd be more willing to agree. But, it seems like it yanks from the multiverse at random. Rainbow Rocket being there also challenges regular Sun and Moon being canon.
