General Thoughts
I'm very happy with the metagame we are experimenting right now. After the month of June which has been the most chaotic month of ZU history with changes every five days, we finally have something stable for at least the whole july month. A transition is happening, we had a metagame where HO was the most dominant playstyle with thievul and thwackey and now, it goes to something bulkier but also more diverse where plenty different playstyles become viable. Balance, Stall, Rain, webs which were underused previously do a big come back and it's in my opinion for the best. I always disliked a metagame 'farwest' where you had to kill quickly mons of the opposite team. More reflexion is always welcome in a competitive game.
There is also a smallest transition but which stays important to notice, it's the transition of a metagame centred around physical mons to a metagame where special mons are more and more common. It started peacefully in June where we lost two Vally in exchange of Thievul and then Kadabra. Physical mons such as Raboot, Persian, Thwackey or Gourgeist stay however common. With shifts of this month, it's an other story. With the exception of Gourgeist-Large and Farfetch'd, every other mon we got are special : Ludicolo, Mime, Mime-Galar, Gothitelle, Shiinotic, Corsola, Palpitoad. We also only have one Vally left with Silvally-Ice, which is also often regulary mixed or special even if physical sets stay more common. This special shift will influence the meta for sure.
New mons

Ludicolo
Only Spd Sliggo, Shedinja and AV Ludicolo are able to switch on this thing under rain. Even max spd Dusclops is 2HKO after rocks by Hydro Pump, other mons are deleted by weather ball or strongly weaken. It's therefore a big threat in the metagame and bordeline unhealthy to deal with. Rain is however not as common as we can think which is in my opinion due to the presence of Mime-G in most of teams currently which is able to provide certainly the best offensive anti-rain measure with the combinaison of rapid spin/freeze-dry/focus blast. Auto-rain Ludicolo is still possible, at the cost to rely only on Hydro-Pump/Surf and not Weather Ball, which stays very correct. I have mixed feeling on this mon with on paper something which is almost unmanageable and a lack of use in practise.

Mr. Mime-Galar
Mr. Mime-Galar is a new figure of the ZU metagame. It provides a great support to the team in being able to combine a good spinner, sometimes a wincondition, speed control in one mon. The fact that it's able to outspeed Eiscue at +1 in speed no-noice is relevant as well. Some people say they struggled to deal with Mr. Mime-Galar, it was personally not my case, it's notably unable to break Dusclops and weak against bullet punch/first impression. At the contrary, it's in my opinion a great addition to ZU since we lacked of hazard removers previously. Lets wait and see how it evolves in the future.

Mr. Mime
Mr Mime from Kanto is a really good mon but suffers from the Silvally syndrom. Since you can only play one Mime by team, you would generally choose to play its Galar from which is simply able to provide more utility with rapid spin and a better speed tier. Anyway, I think regular Mr. Mime beneficts a lot for a choice specs set since fairy resists are uncommon and on mons without recovery (outside of rest talk klang). It can also act as a surprising good answer against uncommon mons such as mono attacker sliggoo or hakamo-o. Scary mon for sure but it's a bit early to determine how it will influence the metagame.

Gourgeist-Large
Certainly one of the best mon of the metagame. I still think this pokemon is really powerful, specially since we don't have anymore tangela in the metagame. The presence of ice types obviously hurts but its ability to wallbreaker stays very scary. It wasn't a drop so everybody is not aware that this mon is playable, which explains maybe why I haven't seen many gourgeist played until here. Usage doesn't mean viability though and I'm sure it will be one of our most effective wallbreaker. Its defensive set will stay good, notably against other Gourgeist-Large band but certainly a bit less common than before since there are less mons it is able to counter.

Dusclops
Dusclops is back and Dusclops is better than it has ever been this generation. It's one of the best Mime-Galar counter, it beats reliably every spinners we have and its presence alone makes teams stack hazard more powerful than they should be in theory. The fact that we got so many special attackers this shift is also a gift for its viability. It also learns poltergeist now which is eventually good for more offensive sets or just to one shot Mime. A good double switch is still able to punish it, don't get me wrong but it is one of the new face of ZU. It's also obviously a big buff for stall teams.

Shiinotic
If I wrote a post before Gourgeist-Large comes back in ZU, this part would be really different. Shiinotic is effective to deal with physical attackers such as Persian or Linoone, it offers a nice utility thanks to its fairy type to pressure dragon types now that togetic is gone and spore/leech seed stay nice utility moves.
However, Shiinotic stays relatively frail, which means it loses two important match ups than itemless Gourgeist-Large doesn't lose : against band Gourgeist-large and against machoke flame orb. Considering these two mons are the best physical attackers in the tier right now if we don't count Silvally-Ice, it's a big issue. Also, defensive sets are easier to switch into than it looks like, notably with spd dusclops or klang. Offensive sets have maybe a better potential even if being walled by Ivysaur or gloom sucks. Shiinotic is definitely a weird case of a good mon which is in a metagame which is not kind with it. It risks to hurt its viability a lot.

Corsola & Palpitoad
Two water types rockers we are glad to get. Even if the first one is more common in balance and the second in more offensive teams, I group them together because they are nice additions to the metagame. They come in a metagame where Ludicolo, Mime-G, Gourgeist-Large, Machoke are available so it definitely sucks but more options are always welcome.
Playstyles

Stack hazards
I'm glad Empoleolindo posted his team because I made a team very similar to this with Koffing instead of Trubbish. The combinaison of the departure of Togetic and the arrival of Dusclops and Mime-Galar buffed heavily teams stack hazards. Most teams rely now on a spinner unable to break Dusclops/Shedinja to remove spikes&t-spikes, which makes this playstyle painful to deal with. The fact that our other defogers remaining share at least an ice weakness doesn't help either considering how strong Mime-G is and that Silvally-Ice is our last Vally. If you need to pressure this archetype, I think the best way is to focus on strong wallbreakers and manage somehow to remove hazards, which is not always easy but it's possible.

Webs
I'm not a big player of webs myself so I won't write a lot on this subject. However, several people built successful webs teams lately notably thanks to Gothitelle and Farfetch'd which is apparently better than expected . Machoke Flame Orb, which is one of the most dangerous mon to switch into, beneficts specially a lot from this archetype. Sticky webs have been really underplayed during the month of june so it's a good news for players of this archetype.

Stall
With Pyukumuku, Stall is back and even if people haven't played that a lot since it's not specially the funniest archetype to play when new drops are available, you cannot ignore anymore its existence. Its usage in tournaments will rise after a relatively low usage in zult, being only played three times if I'm not mistaken. I don't think teams are prepared yet to face that so we should be specially careful about this in our teambuilding. I think we have currently necessary tools to deal with that but if this playstyle becomes oppressive, the community will see what can be done.
Some winners

Shedinja
Shedinja is surprisingly a legit pick in teams outside of stall right now. With Boots, it's able to switch far more often than in previous gen and the recent buff of poltergeist makes it more difficult to switch into. More important, its ability to counter Ludicolo, Mime-Galar, regular Mime without mystical fire, and also Eiscue, offensive Wartortle sets makes Shedinja really antimeta at the moment. It is able with some double switchs to weaken quickly a well-built team. It's a Pokemon which stays difficult to use and easy to lure obviously but it's probably the metagame where it has been the most viable.

Silvally-Ice
It shouldn't be a surprise for anybody but Silvally-Ice is our last Vally remaining which means it doesn't have competition anymore. Physical, mixed, special sets are all viable and it does what Vally has always done before. People need to manage only one Vally though so it shouldn't be dificult to find answers but it stays nevertheless really threating in late game. Especially, teams stack hazards often lack of a consistent answer since they have limited slots. It's a top tier of our metagame.
A loser

Eiscue
Eiscue hasn't been consistent lately, it has been only used twice in zult without killing more than one mon in the whole tournament. These shifts aren't kind with it either. Pyukumuku means the come back of a hard counter. Mime-Galar is faster by one point than Eiscue at +1 if Ice face is not broken and is able to revenge kill it easily. Priorities such as Shadow sneak from Gourgeist Large Band or Bullet punch and First Impression are more common. Hyper offenses are generally less consistent than in the past, Mime-Galar nerfs Screen teams with its ability. Also, the only HO which really become better with this shift are rain and webs, two playstyles where Eiscue is rarely played inside and which doesn't struggle to deal with the penguin either. Only the fact that new mons appear in a tier means a power creep and previous mons become automatically less amazing than they were before. I think it's really a hard time for Eiscue which is hard to be played consistently and which stays unreliable.