Warning: Long post
Sorted within ranks before C. Can probably shift some mons around ranks while keeping the general order.
I did make the choice to split C, I think in light of meta development we have seen enough to have a better gauge of the lower ranks to make the distinctions, and I personally think it is good to separate Pokemon that are clearly not the same power level. Due to this, some mons might have rather drastic rank shifts, but I think the order is generally a better indication.
S
Imposter (
Eviolite, Covert Cloak, Spooky Plate) could add Heavy-Duty Boots, but I think its 4th best item, can be argued above Plate
Pretty obvious, Eviolite isn't as useful as before though, you are highly likely to get Knocked anyways, and Cloak and Plate both can fundamentally change interactions when necessary where playing around Imp never getting Knocked is actually rewarding. Boots is viable on full hazard immune but I wouldn't use it outside of that.
A
A+
Eternatus (
Magic Guard, Unaware, Teravolt)
I think its a popular opinion that this mon is comfortably #2 in the meta. Immensely splashable offensive pressure threat. Vast majority of sets are DEnergy / Torch / SSA / Sap but you have deviations like Sword Spikes and even Gambit. This mon is majorly responsible for a small uptick in Nuzzle (and Glare to a lesser extent) usage because other utility moves just don't pressure it enough, especially considering its high speed tier. Non-MG sets are worse but still workable.
A
Audino-Mega (
Ice Scales, Fur Coat)
Purely because the other stuff are more sus. Very splashable general defensive mon. Can fit either spectrum, running it on the team always grants some security against Ghostceus. Ghost immunity also helpful for otherwise spooky Flutter Mane. Suffers from Eternatus but you should have other checks anyways, and Sunsteel users are worse than they appear.
Arceus-Ghost (
Magic Guard, Fur Coat, Magic Bounce)
Best Ghost-type by far, bulky and lacks common weaknesses to be the ultimate thorn against Rapid Spin, and when considering stack's prevalence its not hard to see why Ghostceus is still good. Ability order might be iffy but MG is super resilient to everything to spinblock, FC is still reasonable because it beats a lot of otherwise annoying stuff, though you obv need a secondary Gren check. Third ability is whatever but I don't think Simple is good anymore, teams have tons of setup checks without even trying and on top of that Sap into other check always works too.
Arceus-Fairy (
Fur Coat, Ice Scales, Pixilate)
Fairy-type is just very very strong in a Dragon-heavy meta and the Arceus opportunity cost is the only thing holding this back from higher. FurScales + Take Heart is just consistent. Trades some match ups compared to Audino defensively. Pixilate is also rather solid, rking practically every offensive threat, having still decent defensive utility, and can run a myriad of coverage.
Celesteela (
Regenerator, Fur Coat, Well-Baked Body)
We all love and hate this mon, but it is one of the most defining mons on one of the stronger archetypes currently. Warps removal meta around it due to its matchup against Mortal Spin. The lack of bulk is not as prevalent on the typical structures it is found on because it is treated more as an utility mon rather than actually being an integral part of the defensive core, and most nuclear wallbreakers are held back through hazards.
A-
Necrozma-Ultra (
Magic Guard, Sheer Force, Adaptability)
I have looked at this list for like 30 minutes and concluded that among the rest of the mons this is the one I would put at the top. The reason is very simple, its relative success is backed up by usage. It doesn't have the same speed tier utility that other offensive mons have but it compensates for having a scarier offensive profile.
Sceptile-Mega (
Magic Guard)
Some people think I hate this mon, I actually have nothing against the mon I just think there was overfanfare over the mon. The mon is very linear, it has one set with minor move deviations in the fourth slot, it has an excellent speed tier, sufficient power without being choice-locked and resilient to residual damage. It revenge-kills stuff, is sticky, and because of that can often stay alive until late game where it can threaten clean ups.
Garchomp-Mega (
Tough Claws, Adaptability) other abilities also work but they all are similar enough
Chomp here because it feels more reliable than Gren. Rocks resist is so big as with more bulk. Slower speed is unideal but with something like Band Gren you are playing out a reasonably long game often anyways with repeated positioning. Setup also is still immensely threatening and can have several opportunities to threaten breaks and sweeps.
Greninja-Ash (
Sniper, Sheer Force)
We all know what this mon does, Sheer Force has seen some rising usage but also faces a myriad of problems despite not being choice-locked. Biggest issue for the mon is hazards and its tendency to rely on repeated switch-ins to set itself up by Knocking helms, chipping checks, avoiding rks.
Blissey (
Magic Guard, Regenerator)
Has a lot of issues in the present meta with stuff that traditionally had immense struggles with it teching moves that let them bypass it one way or another. That being said, its presence demanding such generally otherwise suboptimal moves cannot be ignored, its still a great pivot + support if Wish, and is one of the most consistent answers to STAB + Cage Take Heart sets.
B
B+
Arceus-Ground (
Ice Scales)
Has permanent issues with improofing and Celesteela, and also requires a separate check to Sceptile, but otherwise accomplishes the Scales role well. In particular as an UNecro answer, since it would have to fit moves like Mountain Gale (not a bad move btw)
Kyogre-Primal (
Regenerator, Magic Guard, Fur Coat)
Still does it what it typically did, but more offensive setup sets are popping up around.
Alakazam-Mega (
Beads of Ruin, Psychic Surge)
The ultimate issue with MegaZam is that it doesn't have a particularly spammable move while requiring choice-lock for wallbreaking potential. Being full susceptible to hazards is a big deal here because Zam is even more reliable on switching in repeatedly to make use of its speed tier and Psycho Boost. Maybe Psychic Surge might be better just for providing EForce and boosting Psystrike or some other innovation needs to be made to make the most out of this mons offensive profile.
Dialga-Origin (
Regenerator, Ice Scales, Unaware)
Always annoying to improof but it is the other main Mortal blocker that typically beats most Mortal users that can get past Steela (e.g. Waters). On top of that it has good enough defensive presence to check some dangerous threats.
Arceus-Water (
Fur Coat, Ice Scales)
Hard to exploit typing, and Water is a reasonably good STAB at chipping defensive stuff. Idk if you would want to standard TH this though, as Water can invite in a lot of the Dragons.
Swampert-Mega (
Ice Scales, Fur Coat)
Kind of like a sidegrade to Groundceus, the Water-type can be really helpful in resisting Fire, neutral Water, and making Imposter susceptible to Salt Cure.
B
Solgaleo (
Primordial Sea, Well-Baked Body, Regenerator)
Fire-immune Solg actually blankets a significant portion of offensive threats, mainly the Dragons but also Pixi users. Easily the best Steel for this role because of general bulk + speed tier letting it creep potential breakers like Garde and Blaze, also Psychic-type is useful to remove Fighting weakness and provide potential Psychic-STAB to hit Etern harder.
Lucario-Mega (
Tough Claws, Magic Guard)
Kind of anti-meta considering the popularity of Fairies, setup sets are terrible but Band sets, despite being rather prediction reliant can be scary and unlike competition it hits Imposter hard.
Miraidon (
Magic Guard, Fur Coat, Regenerator)
I don't even know where this is supposed to be, could be lower tbh but it does outspeed and have SE stab against some bigger threats and Electric STAB is useful against Celesteela.
Ho-Oh (
Ice Scales, Magic Guard, Desolate Land)
Has seen success in OMPL but I don't find it particularly that good. Spikes immune means nothing when you need to run Boots or MG anyways, and both Scales and MG sets are undermined by the Thunder Cage weakness. Theoretically strong V-create makes it good at spinning but then you run into Fire-immune Steels or regen diao.
Arceus-Electric (
Fur Coat, Ice Scales)
Decent Arc forme, STAB Cage is obv very good and Ground is not a particularly big type to be weak to outside of Groundceus's Judg/Rev Dance. The Chomp weakness is also not as significant as like Ghostceus vs Gren because it outspeeds it.
Arceus-Fighting (
Fur Coat)
Rocks resist, resists basically every physical offensive move, Fighting hits every physical mon for good damage, and several threats that would be able to capitalize on Fighting are on the decline. Take Heart might still be sketch though because good luck punishing Etern.
Zamazenta (
Fur Coat)
Its Fightceus with less bulk but it outspeeds a useful bit more. Combat Torque/Triple Arrows (if you can punish Etern elsewhere) are excellent moves only held back by 16 PP.
Flutter Mane (
Flare Boost, Beads of Ruin, Adaptability)
Full hazard weak, Specs is really hard to make work given the popularity of Normals and Regens, and Flare Boost burn chip compounds with other residual damage to compound the issue and makes it want to click Pain Split too much, which is capitalizable especially by Scept. Other sets are mostly unexplored but potential issue with lacking power.
Lunala (
Ice Scales, Simple)
Ice Scales has seen some use but it's really susceptible to a lot of stacked chip damages. There have been some setup sets ideas with Spooky Plate but those kind of have even bigger issues with residual. Simple is not used but its probably better than Ghostceus for the Stored Power.
B-
Meloetta (
Ice Scales, Prankster) Regenerator is probably fraud
Technically less valuable due to the decline of Alakazam and Flutter, but it still has a much better matchup into Eternatus than Audino.
Muk-Alola (
Regenerator)
Actually good at its job, its the RegenVest version of Melo by blanking special threats. Very reliant on intact AV due to modest bulk and no Dragon resist. Can't be poisoned, less vulnerable to physical Poison moves, Dark-type full stops PrankShot, and unlike Ting-Lu it can actually run Nuzzle and Para Imposter.
Lopunny-Mega (
Magic Guard)
City explained this, its fast, MG, pop bomb strong.
Blaziken-Mega (
Tinted Lens, Tough Claws, Desolate Land) This ability order doesn't feel right but I know nothing
I'm not a huge fan of this mon but V-create is really strong.
Gardevoir-Mega (
Pixilate)
PixiSpeed is incredible utility even from 85 attack, and its raw Boomburst power is enough to muscle past through teams given enough time. Main thing here is for sure PixiSpeed which helps makes it easier to fit and use.
Chansey (
Magic Guard, Regenerator)
I think non-Evio Imp is getting better/more prominent and with that it means Chansey over Blissey is more possible. Extra bulk helps greatly against stuff like SSA and Sword though lack of Lefties/hazard immune depending on set is definitely not optimal.
C
C+
Koraidon (
Teravolt, Magic Guard, Tough Claws) ability order isnt it but idk anything
Not very convinced with this mon, offensive sets clearly aren't it because it needs Band and both STABs have immunities, offensive utility sets kind of face competition, defensively Dragon is a detriment compared to the other Fighting-types, esp with Zama outspeeding Gren anyways.
Magearna (
Primordial Sea, Levitate, Well-Baked Body)
Not terrible, can hard wall Etern or Chomp depending ability and Doom shuffle sets are definitely legit.
Melmetal (
Regenerator, Fur Coat)
The better Steelix, Nuzzle hits everything and its excellent physical bulk lets it even scout Band Gren in a pinch.
Palkia-Origin (
Speed Boost, Magic Guard) Fur Coat somewhere
Offensive sets are definitely not it, if you wanted to actually abuse Ground-types theres Scept. If this mon could run both Speed Boost and MG it would be good. Defensively interesting typing for sure, but faces competition.
Ting-Lu (
Fur Coat, Regenerator)
Main issue is being highly reliant on AV for special bulk like Muk, but needing two moveslots to both punish Imposter and actually threaten mons like Etern, which ends up resulting in 4MSS so structure becomes more forced to have a natural revenge-killer instead.
Zacian-Crowned (
Intrepid Sword)
Similar to Lucario, STAB Sunsteel is definitely useful, and imo Zac-C performs setup sets better just by virtue of Speed (SD no ability = Tidy ability = SD speed boost). Has some severe 4MSS though and Imposter can be annoying even with V-create.
C
Deoxys (
Sheer Force)
I think SF is probably the only set as other sets just lack power so you want to run 50 moves. Even then the main issue is people are already accounting for the stronger UNecro. Good when the counterplay idea to SF Psychic is pivot into RK but that feels rare.
Kyurem-Black (
Sword of Ruin, Magic Guard) I can see MG first
Rocks weak so you need to give up power which just makes Chomp that much stronger.
Kyurem-White (
Refrigerate, Dragon's Maw)
Also rocks weak but at least Boomburst is more spammable and Extreme Speed is priority. Garde kind of just feels better though.
Registeel (
Primordial Sea, Regenerator)
Solgaleo is just better almost always. Could drop further but TTTech is going to cry about it.
Slowbro-Mega (
Regenerator, Fur Coat)
Pretty sure Regen is just better, but probably no AV. Celesteela usage means Electric coverage is ubiquitous and the Psychic-type does not do any favours here. Regen seems ok though as a slow pivot that can sponge some hits.
Steelix-Mega (
Regenerator)
Good luck ever punishing Imposter outside of a Knock.
Yveltal (
Fur Coat, Magic Bounce, Magic Guard)
Not real, weaknesses are too annoying and the Ghostceus safe net is not worth using outside of very specific HO structures.
Zacian (
Fur Coat, Ice Scales)
Theoretically it doesn't seem bad as fast fairy that outspeeds a few crucial Dragons, but Etern smacks it with STAB and UNecro has coverage and can also hit on both sides. It is also more passive than Zama because Fairy gets full blocked by a lot of utility mons.
C-
Altaria-Mega (
Fur Coat)
Idt this mon is unusable, typing is excellent, held back by bulk obviously, run +Spe lets you outspeed neutral Chomp which is something.
Blacephalon (
Adaptability)
Rocks weak but not unsalvageable.
Iron Valiant (
Pixilate)
Strongest PixiSpeed which is incredible anti offense and hits Imp super effectively, but doesn't have any defensive utility like Pixiceus. Fighting STAB is probably not even good because you want V-create to hit Celesteela. Also hates being Fairy-weak meaning even Audino is a threat.
Nihilego (
Sand Stream, Ice Scales)
Sets sand.
D
Aegislash (Unknown)
Not very good defensively but can do sapblock stuff and utilize that as a countermeasure against Imposter.
Ampharos-Mega (
Magic Guard?)
Viable enough considering its Miraidon with slightly less bulk, more damage, and underspeeding stuff. In particular it can threaten Steela as a slow pivot.
Arceus-Dark (
Ice Scales, Fur Coat)
Honestly Dark isn't that bad defensively. Offensively its not great but Tcage is a pretty borked move anyways.
Arceus-Fire (
Magic Guard)
Sus mon, rocks weak is highly limiting to what it can do.
Arceus-Poison (
Fur Coat)
I'm pretty sure its forced into some kind of Ruination ideas which is highly exploitable. Defensively the type isn't that useful either.
Arceus-Psychic (
Ice Scales, Fur Coat)
Its kind of like Fightceus where you have Psystrike to annoy Blissey. Bricked by Ting-Lu though.
Clodsire (Unknown)
Honestly not bad SpD and typing, low Def can help with offensive improofing too. Also no Grass weakness means not being OHKOed by Chloroblast without Scales.
Dondozo (
Fur Coat)
The big problem is that it wants to use Flip Turn but a lot of stuff are running Teleport these days so the slow speed ends up not pulling through as much, esp considering it doesn't exactly want to switch into Regen mons.
Gholdengo (Unknown)
Its Aegislash but you give up even more bulk to be less passive.
Giratina (
Regenerator, Prankster)
Yes it went 4-1 in OMPL but it also did practically nothing every game. If you watch the games the only thing it did was parting shot and haze, literally use any other prank if thats the objective.
Gyarados-Mega (
Magic Guard)
Dark-type not useful even for Jaw Lock shenanigans.
Iron Hands (
Fur Coat)
Definitely not that good but if you run both STABs you are pretty good spinner.
Landorus-Therian (
Good as Gold)
Cheesy gag setup.
Necrozma-Dawn-Wings (
Simple)
Extra power over lunala can be useful.
Ogerpon-Hearthflame (
Desolate Land)
cityscapes.
Pikachu (
Imposter)
I will wait for the day someone uses this to force a game into coinflip.
UR
Arceus (
Ice Scales)
Use another Normal or Arc forme.
Beedrill-Mega (
Teravolt, Sword of Ruin)
Rocks weak pivot that gets walled by everything.
Buzzwole (
Fur Coat)
Fire-weak Fur Coat just use another Fighting type.
Giratina-Origin (
Simple, Magic Guard, Magic Bounce)
Lunala or even NDW better.
Metagross-Mega (
Regenerator, Primordial Sea)
Use Solgaleo, +spe solg outspeeds basically everything it needs to with slightly less def than +def megagross while notably more spd.
Pheromosa (
Tough Claws)
Its fast but Zam is less prominent, offensive stats aren't really high enough and STAB combination is poor.