Don't really have much of anything to do nowadays so I figured I'd take a crack at theorycrafting the DLC2 meta. Bear in mind of course there's no telling what the galar birds and regis could entail, as well as anything else they might be keeping hidden from us.
Starting off, the returning mons:
No formatting = viable but not dominant
Red strikethrough = falls off
Green strikethrough = won't be used immediately but may become viable later on
Blue circle = dominant
Blue question mark = possibly dominant
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No surprise here, Dragonite reigns supreme with its new Flying STAB, as well as a plethora of sets to choose from.
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This one seems to be more of a hot take so I'll explain: basically band just kos everything. Not only that, but you also have the option to act as an antistall with Taunt. I don't think it'll take long for players to adjust to it, nor do I think it'll necessarily be the very top of the meta, but I'm confident it will do great.
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Latias has the resources to both ko things, stall, and screw things over with Trick. It has the full package to take on just about anything it wants. The only issue is that it naturally experiences a lot of opportunity cost to switch between each set. Because of this, I feel it'll be more of a tour threat than a ladder threat.
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Another Pokemon that can do just about anything it wants. Not really much of a surprise to anyone so I won't go in depth here.
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While most would say it is easy to Download-proof mons, I'm thinking physical Genesect will actually have some decent merit to it, thanks to Extremespeed no longer being locked to Hasty. Additionally, I think the nature of the meta will allow it to expand out to sets besides your average choice options, though I'm sure early on that choice will be pretty much all that's used. Ultimately, I feel Genesect will be assuredly great, though I think it'll be more of a slow burn before people bring out its full potential.
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To nobody's surprise, Tapu Koko will absolutely be a dominant presence in the meta. Similar to Latias, it has all the resources to successfully operate under just about any archetype it wants, though Koko of course has the added benefit of Electric Surge providing it that extra kick to make Specs Rising Voltage hit just about as hard as the cursed Z-Thunder of its time in SM. Whether or not it's something that will need to be banned is something that will have to be seen; I would imagine it'll bank on how much people do their best to develop it into something banworthy.
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Metagross is an interesting one. With exceptionally tanky stats, the freedom to run almost any item of its choosing, and a wide variety of moves at its disposal, I can foresee this Pokemon keeping people on their toes. That said, similar to Latias, it suffers from considerable opportunity cost when choosing between each set, in addition to not really having as great of a set of resources to fill as many archetypes as Latias can. Ultimately, it's one that I can see doing well, particularly in tournaments, but probably won't dominate the meta by any means.
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Garchomp's a killer mon with a great speed tier and a newfound (viable) multihit + speed control move with Scale Shot, as well as a great appreciation for the lack of HP Ice's existence. With that said, it's understandably not as versatile as many of the above mons, and will more than likely fluctuate in viability based on how the meta develops around it, so realistically it'll be one to keep an eye on, but not necessarily fear.
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Basically just what Archeops does in every gen, but with Dual Wingbeat now. Similar to Aggron, I think it'll be relatively easy to adjust to it if you get sick of losing to it, but ofc the reason why Archeops isn't quite as assuredly good is because of the over-reliance on hitting Head Smash, as well as how easy it is to screw it over with a Scarf. You could always clap back with your own Scarf, but that comes at the expense of every KO you needed Band for.
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Much like Garchomp, Landorus greatly appreciates HP Ice no longer existing. All things considered, however, I don't feel it will be significantly dominant; I feel that any attempts at building it will be spread too thin, trying to cover as much as you can in a single set, but never necessarily being able to cover all too much at once. The main reason I drew attention to this mon is rather for the Therian forme below.
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As usual, the dog is better than the man. The added power and Intimidate works wonders for Lando-T. All things considered, the options it has between Band, Scarf, AV, and setup all make it a tough Pokemon to account for. That said, much like Latias and Metagross, I can foresee Lando-T doing better in keeping people on their toes in tours, rather than being a scourge of the ladder.
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Pheromosa's got it all; power, speed, and a killer set of moves to choose from. I can easily foresee people running Specs with Blizzard out of desperation to cover Dragonite, though physical sets all come with their share of benefits as well. While being checked by a Scarf is a major weakness, I can very feasibly see some (crazy) people running their own Scarf to get around them. Additionally, tactically bulked sets that make use of Lunge/Skitter Smack can take advantage of Pheromosa's deceptively bulky nature. In a sense, it's similar in potential to how I described Landorus-Therian.
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Kartana just bops things as usual. This Pokemon will singlehandedly (swordedly?) force things to bulk up considerably on the physical end or die trying. Mostly die- Band alone already shreds near everything, but there's also the added setup factor with double dance, synthesis, and Sacred Sword bypassing defenses or Leaf Blade getting a crit sooner or later. My only concern that holds this mon back from being assuredly dominant is that it's also pretty susceptible to Scarves, and simultaneously not really that great at making use of its own Scarf.
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Naganadel is a Pokemon whom I have no doubt in my mind will thrive, though the main matter I foresee with this one is that it is rather one-dimensional. You're pretty much just using STABs + Fire Blast for everything. Not to mention going the setup route with Nasty Plot means you need to sacrifice one of your moves between either your Poison STAB, Fire Blast, or Laser Focus, which is incredibly useful for breaking past special boosters. Additionally, it suffers from the same issues as Kartana in being susceptible to Scarves while not being that great of a Scarf user itself.
Some noteworthy mons that I don't feel will dominate:
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I'm sure Zapdos will do great, but I simply don't feel it'll fit among the very top. Its bulk simply isn't up to the task of dealing with the power level of the mons described above, as well as everything else, and if you do go out of your way to make it hyper bulky, now you've gone and made it too slow to cover other threats! Attempting to EV it to cover everything is a task that will simply be in vain, which is why I feel base Zapdos will be no higher than A rank at best.
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I know a lot of people are excited about Heatran, but I just don't think it has what it takes to dominate the meta. You've simply just got way too many mons that either clean KO it, bulk it and either KO or set up, or have some other crafty tricks to get around it, while Heatran just isn't equipped to do the same back to them. If we were just dealing with the mons we have right now, that'd be another story, but ultimately I just feel Heatran doesn't have that great of a matchup spread against everything else it's returning alongside.
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I'm sure I'd get plenty of stares if I just said out of nowhere that Lele wouldn't be that great, but hopefully after reading everything above this point it makes sense why Tapu Lele is here. While Psychic Surge with Expanding Force is definitely a force to be reckoned with, there are simply just too many resists and mons that just KO it returning for it to really make good use of it, especially with consideration to the AV culture we have going on right now. Don't get me wrong, this thing is still hitting like A rank minimum, I just don't feel it'll be as dominant as some may think it will be, let alone banworthy.
Moving on, we have the Pokemon that are currently usable!
Simply put, I don't think anything we have currently is going to dominate the meta when DLC2 comes. The top tiers will still be relatively solid, though they're going to be absolutely swamped with competition. I'm feeling upper Cs to lower As all around in this batch, with Dragapult being the unsuspecting champion of the bunch, at least until Dragonites start bulking banded Dragon Darts.
And lastly, we have the mons up for being unbanned upon DLC's arrival! While not all of these are necessarily guaranteed to be unbanned, I just took the ones that looked like they have a nonzero chance of being unbanned.
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While being the least likely to be unbanned of the bunch, Marshadow's been taking some hits as time goes by; fairies are rising up, physically bulky mons that can KO it are getting better, and now there's a whole slew of mons coming to cause it trouble. Even if it doesn't get unbanned a couple weeks from now, it will assuredly be something to consider later on. Considering the meta I've described above and below, Marshadow definitely has some steep competition, though of course it's still very well capable of doing anything it pleases with much less opportunity cost per set than any other mon I've presented. If allowed into the meta, this is something I can definitely foresee enforcing widespread adaptations in order to beat specifically it, though to what extent exactly is something that would have to be seen.
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While Magearna absolutely despises many of the returning Fires and Grounds, it still has plenty of tricks up its sleeves, especially with moves like Encore and Trick at its disposal. With that said, I feel Magearna will actually be more of a slow burn like Genesect, since people are likely just gonna jump straigt to choice once it's freed, and progressively build to the more tactical sets that'll make it shine in tours.
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Unlike Magearna, this big lugnut can actually just eat a lot of the heavy hitters returning, though this comes at the expense of versatility. Mel's pretty much always gonna be using the same set of moves and items, which'll result in it being rather predictable, especially when you look at its teammates and notice a suspicious weakness to special attackers. Despite this, Melmetal is still pretty well equipped to just muscle past a lot of its checks, in addition to the plethora of matchups that it already wins through virtue of just being Melmetal. This could very well be something that needs to be banned, though, like with Tapu Koko, it'd have to be something where people develop it to the point where a ban is necessary, since theorycrafting alone can only go so far.
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Necrozma is very nicely built to do just about whatever it wants, similar to Tapu Koko, though it isn't limited to just STAB power, as it has a massive arsenal of options at its disposal, in addition to the 160 BP nuke that it can fire off as it pleases without being put on what is effectively a timer like Koko. Despite this, it does still have issues with Substitute, as well as being Trick locked if you're not using Specs. The opportunity cost between each set hurts, though I feel Necrozma will make do quite nicely.
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I feel Jirachi will still be alright. Great speed and bulk with plenty of setup options and Encore after all, though I do feel that its overall damage output is relatively low, so unless you're using a Trick of your own, it'll be notably susceptible to other Pokemon's Tricks. In general I feel people will wanna look at all the shiny new Steels and the returning Magearna and Melmetal before looking back at Jirachi, so it'll likely be some time before Jirachi gets attention once more.
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80 speed just ain't gonna cut it anymore, and all the berry Counters in the world aren't gonna make Togekiss as good as it was in the DLC1 meta. It may very well see some use once things have settled down and potential bans on Tapu Koko and Melmetal have gone through, but until then, Togekiss likely won't be seen very much at all.