After playing for a few hours this afternoon and earlier, and observing some other games at higher ladder I’ve got some early thoughts-
It’s actually impressive that this tier feels so much more playable and enjoyable than I expected it to be given all the insane new Megas. There’s of course some stinkers that stand out mega and non alike, but I’ve found it way better than I expected an early

(Z Mega)
Unsurprisingly this is very good, though I’m skeptical if this needs to go right away. It’s strong for sure but unboosted it isn’t THAT insane and without a boost it’ll come up short even against various offensive pokemon like Keldeo and Zeraora who threaten to blow it up, while defensive checks exist with bulky Garchomp, AV Magearna, Slowking, and has a hard wall in Spdef Dondozo. It’s very good don’t get me wrong, and I could see it being a problem down the line maybe but atm I don’t think it’s an issue.

(Mega)
This thing, other than its Excadrill match up (lol mold breaker) is really nice, It beats up on all the other grounds and bullies the steels that are everywhere atm, and with excellent stats can be customized to whatever you need it to do. It’s such a good SR that beats most of the removal tools, and trades with nearly anything in a pinch.

(Z Mega)
Pretty strong as expected. It’s a great source of speed control and wall breaking in one slot and unlike Lucario or Absol Z, isn’t paper thin and has real defensive utility like checking Rotom W, non Play Rough Zeraora, Raichu-Y. NP sets are super potent and I think this Mon is better than Lucario Z atm.

This thing is a gift from Arceus for defensive teams. A blanket check to all sorts of boosting threats and offers a strong wincon as well with classic Curse. While it does still suffer from 4MSS like in SV OU, I feel like it’s less pronounced here and won’t hold it back as much. Definitely a valuable asset in a volatile early meta.

“Hey guys power creep is nuts this gen it’ll be balanced now!”
so anyways this is easily problem #1 and I don’t think this should stay for long. You’ve 100% seen this on ladder if you’ve played at all in the last 14hrs. Scarf, Band, Specs, LO, whatever you want it to do it will do it very well and it’s very hard to dance around its coverage and power thanks to Download. It’s brutal, and even more so when backed by hazards and I think we’re better off without it.

This is also problematic and realistically needs to go eventually. Taunt+BU is incredibly restrictive to handle in the builder and strangles bulky teams way too much too easily, and even without Tera it often requires multiple Pokémon to bring down which leaves a mess that’s easy for its teammates to capitalize on.

atm I don’t think Magearna is a problem and if anything I think it’s great for the metagame. Highly versatile and customizable, offers fantastic role compression and check to a ton of stuff, and isn’t unreasonable to account for even with the threat of SP sets. Of course that could change as people explore it more, but for now I think it’s perfectly fine.

No lie, this thing is kind of fire. Intimidate with its typing and toolkit is unique when combined. With a good secondary partner you handle a surprising amount of physical attackers, and thanks to Mortal Spin you can offer removal and a way to put stuff on a timer. Solid Spiker too, and decently customizable. I encourage people to give it a try! You might be surprised!

More limited without Tera but still solid against a number of stuff as an emergency check of sorts based on moveset. Salt Cure is even more near impossible to switch into in this tier and backed by hazards is a terrific progress forcing tool. The bulk is still good, and it especially bullies other bulky teams pretty hard if they can’t damage it quickly.

This Mon is really nice. Scarf is nice speed control and revenge killing tool, specs is potent as a wallbreaker when there aren’t that many great water resists especially now that it gained ice beam and earth power for dragons and galarian slowking respectively. Very cool.
And that’s all from me for now. Hope y’all are having fun!