Happy day before shifts days! With another big change in the meta likely incoming i figured id drop some of the early things if noticed ab the post zac meta for fun as I think we've learned a lot of interesting things.
Arceus Dark and Palkia Origin, are they broken? 
While this depends a lot on who you ask, I firmly think both of these are
not broken. Both of these are obviously still good, but I don't think nearly as demanding as I expected going into this meta. Darkceus is still a huge builder threat, but I've found that more often then not it can be managed without explicitly tooling your draft to never lose to it. It's weakness to hazards, and other chip damage from things like burn, or the fact it can get shut down by paralysis makes it have a difficult time hitting the field, and still a hard time setting up as the darkceus player will have to manage speed ties, or staying alive vs things like arc poison. Palkia is a bit more of a problem, but its counterplay hasn't changed much since the Zacian ban. While Zacian was easily the most consistent revenge killer for it in the tier, the main way to manage Palkia is still mainly focused in out playing it, and managing your speed + hazards to limit its prolonged impact on the game, without zacian it just has a bit less in its way. I'd say its at best the 3rd best pokemon in the tier right now, with Arc Poison and Giratina being interchangeable for the top two spots.

Balance is back baby! 

With one of the generally strongest attackers that was able to tool itself to beat pretty much whatever check it wanted gone, defensive teams are now much more able to diversify their defensive tools to help manage this metas threats, and with a lot more varying options too! Magearna is now more safely able to choose between spdef and physdef sets as is Giratina, and mons like Garganacl feel more more splashable with its ability to apply such consistent pressure to a huge variety of mons with rocks and salt cure. The offensive tools of Balance are now a bit less restricted as well, with old tools like Lando I, Deoxys, etc still being good but certain tools don't feel nearly as required, putting niche answers to stronger mons is less required and really helps make it such that balance has the tools to diversify how it handles the meta at large in my opinion. As again, I do not believe dedicated checks to Darkceus and Palkia origin are required on teams. They can certainly be put to good use, but not having one does not a bad team make in my opinion.

Biggest (niche-ish) Winners

Lots of mons that had a lingering presence/were falling off are really starting to at least make waves on my own person radar, so I wanted to go over a few of my own personal ones and what I think they bring as valuable tools to the metagame rn! (and no im not going to talk about primarina)
Okidogi 
Okidogi already existed pre zac ban as a dedicated arc dark answer with a surprising capability to take on much more of the metagame, and it only gets better with these changes. It still threatens Darkceus, but is able to be a consistent source of knock off that is able to threaten things like Giratina, Terapagos, with the only "safe" switch in to it basically being arceus poison. It's help back by its insane weakness to arc poison as well as the fact it leaves you very open to Landorus, but its utility is something that I think is far more useful going forwards.
Personal ranking: B
Dialga-Origin 
Once a VERY niche and pretty eh mon, I think Dialga has been set up to take more advantage of its special bulk in a much more specially focused meta as a rock setter and phaser, that is still able to apply a lot of offensive pressure notably annoying things like Giratina, CM Arc forms, Terapagos (which I will get to later as while it was good before for sure I think its having a huge resurgence in viability). It has good merit as a lead still, but is also able to be used effectively as a reactive tool to slow down a lot of offensive threats due to its bulk.
Personal ranking: B-
Iron Bundle 
Who would have thought that when you remove the nigh ubiquitous speed tier of Zacian that the next fastest mon suddenly becomes more viable? Bundle's offensive tools plus access to encore and flip turn help it be both an offensive tool and utility option, being able to sacrifice damage for longevity with boots or opting for Life Orb to score more consistent damage vs Arceus and Giratina.
Personal Ranking: B+
Terapagos 
Okay, I know this mon was pretty good for a while but towards the end of Zacian meta it had a pretty notable drop off in usage, as it was not able to hold up to a lot of the offensive pressure being thrown at it from all directions. Now, it has a lot more room to run a much wider breadth of sets in my opinion, with its offensive CM sets being good as always but the potential for phasing/maybe even HO lead sets being something it looks to be a lot more confident in now when it is far less likely to be immediately traded out.
Personal Ranking: A
Anyways, thats some scattered thoughts on the meta. Hope you enjoyed reading and I'm excited to see where things go posts shifts, I bet Mewtwo doesn't last a week.