Favorite paper mario game to be honest, maybe it's it being my first one taking over me but I love it a lot. I really enjoy the soundtrack, characters, and overall gameplay.
I know a lot of people don't like it but I actually had a lot of fun with this game. Ultra Beasts are also a really cool pokemon concept that I like. Not as good and USUM though
I actually like USUM better than moon/sun. It's basically the same game to be honest but I like that it has fun features (like going through the ultra worm hole). The Necrozma fight is badass and actually felt challenging.