I feel like Mega Aerodactyl's really gonna benefit hugely in this meta (As it has in every meta because the thing's just stupidly good) as Bouff said, especially now that Scarf Jirachi is no longer present. Being a solid check to Terrakion (Sets using CB X-Scissor/Earthquake are pretty much a free switch to this guy, and Earthquake does 76.1 - 89.7% to Terrak while Aqua Tail does 91 - 107.7%) as well as Salamence and Heracross means it's going to be able to fit pretty nicely into both Balanced and Offensive teams looking for a bit of a more offensive check to these mons, while sturdier partners like Suicune, Cresselia, Gligar, Nidoqueen, Doublade, Aromatisse(?), etc. Can sponge some of the bigger hits from these mons.
I'd been toying around with the idea of Pursuit Mega Aerodactyl + SD Heracross for the sake of trapping some of Heracross' faster offensive checks, such as Crobat, Entei, and Darmanitan, as they really get pressured by Stealth Rock damage. While this doesn't ensure they're outright dead, it wears them down heck of a lot faster than just letting them switch out for free once Aerodactyl comes in. It's kind of an odd concept cuz Pursuit isn't really needed for Ghost-types as Heracross runs Knock Off anyway, but just for the faster mons that Aerodactyl can more easily deal with, which threaten Heracross. Meanwhile Hera can drink gallons of SCALDing hot water from the likes of Suicune and Alomomola for Aerodactyl, so even if you don't run Pursuit it's still a decent offensive core.
Also unrelated but am I the only one who didn't care much for Celebi or Starmie leaving UU? I never had much success stuffing Celebi into my teams and defensive sets were a turnoff to me for the long list of common weaknesses it had. I mean I could see their viability but I could never make it work. And Starmie's just...Eh, I liked Tenta/Blastoise better for a bulky or offensive Water-type spinner anyway. Raikou though, you were a champ and I'mma miss you. :[