G zapdos not having roost sucks, but u turn, bulk up, brave bird, close combat and throat chop are really nice moves to have. acrobatics and taunt could be fun moves to work with. I do feel like kanto zapdos will still be more useful overall, but this dude still has a shot
G moltres went from interessing to meh without roost, though. Can see the niches over Mandibuzzzzzzz, but not really seeing the big potential anymore with its moveset
man, no terrain moves for the tapus suck. it must have been a purely competitive decision for vgc (i think all the moves that havent been added to their movesets have been competitive decisions) since thematically theyre the perfect things to add to their movepool. also I kinda wanted them gone of the metagame but thats not relevant lol.
Bulu will have a lot more of competition vs boomer with no tutor moves, and while natdex is not an indicative of gen 8 ou by any means, i wouldnt be surprised if it fell out of usage (dont think it'd be enough to drop to uu, but hey stranger things have happened here).
sidenote: can calyrex do anything that celebi cant do better? this is a genuine question, i dont see the point of using rex in any tier with celebi on it