Been playing a bunch since the drops so here are my thoughts on what the frick is going on. I'll layout this post a little as it might get too lengthy, but I need to mention that these are based on the drops only and are just what I have seen and played against, I am not mentioning anything that I haven't used or played against hence why I won't be going through everything.
The Three Musketeers
One of them need to go, but I will be brief because Tuthur wrote a nice paragraph in his post above. I cannot form an opinion yet on whether one is particularly better than the other because I find them to be somewhat match up reliant and all have their effectiveness, especially this early on in the metagame where it is quite chaotic. Toxicroak is the splashiest one for sure and probably the one I find the scariest out of the three, it is effective no matter what and easily fits onto teams as it generally will never have a bad match up no matter what your set is. I do prefer NP over SD sets just because I haven't found priority to be very needed and I don't want to be walled by Jellicent, but even then, a speed tier of 295 already enables you to outspeed an enormous portion of the metagame.
Gallade is quite scary only because it is tricky to switch into, much more than Toxicroak because Toxicroak generally needs a turn to set up. I have mainly used Gallade as a wincon with a Choice Scarf because you literally have to carry a Choice Scarf user on every team and Gallade fits the role really well, nothing really likes to switch into Close Combat and the few walls who do are threatened by Zen Headbutt or Knock Off. For your last move you have a bit of versatility in Trick, Triple Axel, Shadow Sneak, and Memento, which are all fine options in themselves though I preferred Shadow Sneak on my team as I didn't have enough priority. SD Gallade is still amazing nonetheless and most likely even better than Choice Scarf, which makes it a Pokémon that can pick and choose what it wants to beat.
Scrafty is generally just an obnoxious wincon, I have not seen enough Fairy-types being used at the moment, maybe we're all enjoying ourselves with the new toys but remember that Galarian Rapidash is not dead and should be thought of more often. Otherwise, I think this Pokémon generally has good match ups too, physical walls don't win against it so you're pretty much limiting your counter play to Fighting, Flying, and Fairy coverage which all have to be from offensive threats. I have seen a lot of games where Scrafty just sets up and wallbreaks for another wincon like Turtonator or Frostmoth to come in and sweep, and it's just very good at doing that effectively.
I think as a whole all of them are quite centralizing already and need more than one counterplay against which considering the 97 or so other threats who just dropped it does have an immense impact especially on braincells when building. Likewise, I have seen them paired together, and they're honestly even better then because their counterplay generally cannot handle more than one of them. My best attempt so far at checking all 3 of them defensively is to have Golbat and a Ghost-type like Jellicent and Cofagrigus which can depending on their sets weaken or stop them from sweeping but again these are quite unreliable, and I would settle for offensive counter play in threats like Galarian Rapidash which I already mentioned.
Pokémon I don't Know How To Switch Into
There are a lot of powerhouses in ZU and these are the ones I have had the most trouble against, I cannot tell you how hard it is to switch into these Pokémon when you haven't prepared your teams for them yet. Omastar hasn't been talked about enough from what I have seen, all the Shell Smash hype has only gone to Turtonator and for very valid reasons too but, Shell Smash + Meteor Beam is deadly and pretty much secures a kill on so many switch ins like Jellicent, Ludicolo, has a chance to OHKO Toxicroak, and many more. Even if this move can only really be used once reliably it still creates amazing offensive pressure and definitely a very hard Pokémon to switch into. Turtonator is the same except it doesn't rely as heavily on its item and is a much more reliable Shell Smash setter due to better defensive typing and stats. I've seen people complaining and finding it over the edge and I think that so far is a little overhyped, it's not very hard to revenge kill due to its Speed just being very underwhelming and many Choice Scarf users have no trouble out speeding it, and pretty much drops effectiveness after a Draco Meteor. I do think it is a very good Pokémon, but I would consider banning it now to be a little premature.
Alolan Exeggutor is just something that needs to constantly be played around especially under Trick Room where it just can claim a kill so easily, there are not many Draco Meteor switch ins and even less when you consider its coverage. All of this and it being actually hard to threaten out of the field without having a Flying, Fairy or Ice types. Seen it with Choice Specs and while it is scarier to switch into, Life Orb does just enough damage for you to get rid of whatever you want really, you can get your HP back with Giga Drain really easily and choice locking yourself when using Exeggutor is just such a shame because it makes it so much easier for the opponent to revenge kill.
Froslass is so scary and hard to switch into. It has an amazing Speed and goes even beyond everything else on I have mentioned so far because it doesn't even need to set up or rely on any form of support to literally rip your team apart. Life Orb and Choice Band are both good options especially when using it as a lead to threaten out the Ghost and Ground-types. Choice Band Triple Axel can even OHKOs Fighting-types like Toxicroak, Gallade, Soak, and other threats like Crawmorant, while Poltergeist gets rid of Water-types like Jellicent, Ludicolo and 2hkos with like 70% on Poliwrith, Centiskorch, and Aurorus which is so scary to me. The only counterpart Froslass really has is having to switch out or not get worn down enough to where priority can revenge kill it. I have been told that Sneasel is better, which I can agree with on paper but I have yet to see it in a game.
Clawitzer and Magmortar are kind of in the same boat as Froslass and Alolan Exeggutor where nothing really likes to switch in on them but their counter play is still much larger than the above two. Clawitzer hits hard but fails to pick up on many OHKOs which just makes it easily revenge killed and does have a pretty low speed still for a glass cannon type of threat. All the Magmortars I have seen were mostly Choice Scarf to outspeed and revenge kill fellow Turtonators, Sneasel, and everything else that dares outspeed it. Magmortar has access to solid coverage in Thunderbolt, Scorching Sands, and Focus Blast which combined with a 125 spa stat makes your switch ins very limited, Taunt can help it stop its counters from recovering making walls like Jellicent ending up unreliable. Centiskorch is another Pokémon I find hard to counter especially since your best switch-ins will usually be Fire-types and those cannot hit it because of Flash Fire or can't reliably take in Knock Off from it. Centiskorch has great coverage in Power Whip hitting Ground and Rock types that like to consider themselves as reliable counters, also has recovery in Leech Life. It does however balance itself out a little by being pretty slow and having a defensive typing that isn't really hard to revenge kill in this tier.
Kangaskhan is in a similar case as the rest where nothing really likes to switch into it, Choice Band 2hkos almost everything in the metagame like Cofagrigus, Uxie, Jellicent, and Silvallys. Good speed tier which lets it outspeed a bunch of the other good wallbreakers I talked about like Clawitzer, Centiskorch, Alolan Exeggutor making it a solid revenge killer. Kangaskhan has weaknesses though, recoil and just overall lack of speed will make it vulnerable to faster and priority attackers especially with Sucker Punch being resisted by fast Fighting types. Also just use this instead of Regigigas please. Vikavolt on the other hand is just a solid soft check to the many Water-types we have in this tier whilst having an amazing special attack stat, making it very easy to pressure the opponent once in, especially with Volt Switch making it a reliable momentum gainer for teams.
Generally I do think these are the Pokémon that hold an edge over the rest of the metagame and are definitely ones to watch out for as they're all easily to fit into broken / unhealthy categories. Building wise it's very hard, I could even go with impossible to check all of these threats which is why offensive archetypes are just dominating at the moment. I have talked very briefly about them but a lot more could be said.
Some other good threats
Won't go too much in details here because I don't want too write too much, but I consider these Pokémon to be great threats that shouldn't be underestimated. The difference between these threats and the ones I have already talked about is that while they are very good, they are much easier to stop from sweeping or revenge killing your entire team by having a bigger number of checks and counters. Cinccino, Haunter, Electrivire, and Silvallys are great revenge killers with very solid wallbreaking abilities, good speed tiers and can easily put in dents through a team, especially Silvally as it is greatly versatile throughout all the typings and sets it could be using.
Setup sweepers like Malamar, Kingler, Flapple and Frostmoth are also great wallbreakers and wincons. Malamar is bulky enough to sustain many attackers and can only be getting rid of through Bug and Fairy type attacks and even then not all are a secured OHKO, combined with a good defensive typing and average speed making it easy to spam Superpower with. Flapple I have mainly seen running Dragon Dance but it can easily opt to be using Choice Band or Choice Scarf and still be doing strong damages and sweeping through teams. Grass + Dragon coverage is really powerful especially when mixed with an ability like Hustle and Grav Apple which can make counters like Mawile think twice about switching in. Furthermore it can also pivot and use priority in Sucker Punch and U-turn.
Kingler and Frostmoth are ones I consider to need a little bit of support, when not choiced locked both need at least a turn to really have a chance at sweeping but similarly to Flapple this can change the entire outcome of a game as both are really strong power houses. Kingler has a few counters depending on the set like Poliwhirl, Jellicent and Leafeon but again this really depends on what the set is whether it is SD three attack, Agility three attacks or double setup with Liquidation and Knock Off. Frostmoth has less switch ins due to the coverage of Ice Beam, Bug Buzz, and Air Slash / Hurricane hitting almost the entire metagame but at the same time it lacks a bit of power and can generally be revenge killed even at +2.
Haunter, Jynx and Drampa are just nice mid game wallbreakers and can inflict a lot of dammage and do greatly against a wide amount of threats, but are all susceptible at the moment in the metagame being so offensively driven that they can't shine as much due to them being better against balance and bo archetypes. I have to say though that Cramorant is literally just annoying, Gulp Missile is actually a pain to check especially when this thing can paralyze you very easily when you take it down, it's a great momentum killer for the opponent and does a great job being annoying.
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Weather Wars
Big fan of weather teams, they all have great tools in this metagame. Sun is by far the most common and used version for very right reasons in it being the superior weather archetype. Exeggutor and Shiftry really boosted Sun teams massively with their amazing wallbreaking abilities where it is challenging to prepare for them. Exeggutor doesn't really need to setup to get through teams, Solar Beam + Psychic is already great coverage where Skuntank is your only reliable wall against it, and not many scarfers can revenge kill this under sun. Magmortar is also a really solid abuser where Choice Specs has very little switchins and literally gets a kill every time it enters the field. Rapidash is just your good physical wallbreaker but honestly it's very underwhelming, needs to SD to actually get passed checks and even then it doesn't pick up a lot of OHKOs.
Rain has become a bit more present on ladder, maybe just my timezone but I've been seeing more of it and it's just as tricky to play against as sun teams are. Water-types being a bit more bulky makes them harder to wear down but at the same time some of them really lack power and can be played against more easily than threats on sun teams. Omastar and Ludicolo are staples and I would even add that they are a must on rain teams just because they're the best rain abusers with a strong offensive presence that can pick up on common rain weaknesses. I've already talked about shell smash Omastar so nothing new except Hydro Pump picks up anything it couldn't before. Ludicolo despite an underwhelming special attack still has coverage that pushes it through being menacing, if you're playing it with Life Orb you're probably making your life easier because Choice Specs just drains your momentum and you need that on weather teams, being able to get through rain counters like Jellicent and other Water-types is very valuable.
Hail is obviously not as good as the rest but I've actually seen it work quite nicely against certain match-ups, the tier lacks a bit of Alolan Sandslash but still works nicely with other abusers like Rotom-Frost and Froslass. Abomasnow is quite underwhelming just because its too slow to be using a Choice Scarf and doesn't really give hail teams anything it needs besides a slow and average abuser which is why I think Vanilluxe outclasses it, actually has a good speed tier to hold a Choice Scarf and can work as a secondary haiel setter. Aurorus is probably the best hail setter out of them all but even then it's a bit shaky at it, Fighting-types are just too dominant in this metagame for hail to really push through a higher viability.
Bulky Pokémon I like
Starting with the Stealth Rock users I have been enjoying using the most. Rhydon is a great defensive wall and can strike back offensively with good attack stat, can also use Roar to phaze out annoying things like Dubwool or Cofagrigus but I'd rate Toxic or Swords Dance as better 4th move. Similarly to Rhydon, Piloswine is a good Stealth Rock setter and punishes defog users well but has a bit of a downside in being easily worn down. Uxie is the one I have been seeing the most, good momentum in U-turn and Yawn makes a great lead, very bulky but with a good Speed tier, just a really good addition to the tier. Palossand I rate highly because it's really fun to use and actually has recovery but it can wear down your momentum a lot, lack of Toxic on it makes it a bit harder to use as threats have very little trouble switching in on it so I usually get rid of Shadow Ball for it, otherwise it's a decent Fire and Fighting check.
Jellicent is just my favourite bulky mon to use, it's a soft check to a lot of the metagame counting Fighting and Fire types. It can easily get rid of threats with just Scald and Shadow Ball, you have options in Taunt and Toxic which are quite nice as well against the less common fat teams, just a really cool jelly fish. Alolan Persian is a great support pivot and works well against bulkier teams, Taunt + Parting Shot is just really good support especially paired with strong wallbreakers like the ones above or even Super Fang Golbat to prevent foes from healing back up, good speed as well makes you rival against annoying Sneasel and outspeed a good portion of the unboosted metagame. Golbat is probably my favourite soft check to all the fighting types running around and does great support as a hazard remover and stall breaker, again I don't think the metagame is being very kind to it but definetly something I can see rising once the tier settles itself.
Please stop using
Someone please explain to me the appeal in Regigigas, I literally don't get it.