I've beaten the game, cleared the Rainbow Rocket arc, and went searching for Ultra Beasts, and it's officially fantastic! It's a little too similar to the original SM in my opinion, but the changes they made were all welcome and added to the overall gameplay experience (well, except for a couple... but maybe I'll talk about the disappointments some other time).
One of the best things that USUM did was change up the Trials. And my Arceus, I got the rudest of rude awakenings when I went to do Lana's trial. In Moon, she asked me to investigate a "mysterious" disturbance in Brooklet Hill that ultimately led to me fighting Totem Wishiwashi. This time, Lana straight-up tells you that she wants you to fight Wishiwashi so that they'll swim downstream where you'll fight the Totem.
Me: "Okay, Game Freak knows we all played SM, so there's no point in Lana trying to fool us again."
I fight four Pokémon in total - two Wishiwashi, two Dewpider. Lana already told me that the fights are random en