S
Landorus-Therian
Heatran
A lot of people maybe wouldn't have put Heatran here because of its lack of recovery and susceptibility to rocks and spikes damage but I think its strengths definitely push it into this rank. Magma Storm trapping sets might be the strongest offensive force against fat teams right now, especially since most mons that can take on magma storm + taunt don't deal with taking a toxic. It's also a fantastic rocker because of its favorable matchup vs the majority of common defoggers (corviknight, mandibuzz, tornadus, zapdos all can't come in it, neither can spin drill). It unfortunately can't run toxic and taunt on stealth rock sets but it can run both and become an even stronger offensive presence if another teammates frees up that stealth rock slot. Also, despite not being able to recover outside leftovers heatran just somehow always finds ways to remain relatively healthy long-term without hesitating to come in on the action.
S-
Dragapult
I ended up deciding on S- here because I felt like Dragapult was too good for A+ but not quite good enough for S. This mon brings excellent speed control to any team, has an excellent defensive typing that gives it decent pseudo-bulk despite its poor defensive stats, and can bring multiple things to the table on teams. As an offensive status spreading pivot it can be extremely annoying for offensive teams to deal with due to the thread of will o wisp or thunder wave, along with a deceptively potent offensive stab combination. Specs sets have a decent degree of versatility in the move slots and also can be extremely threatening for offensive teams to deal with. Toxapex/Blissey/Clefable type balance or stall builds can make dragapult have a hard time initially making progress, but it also has a fairly easy time getting status on toxapex and clef and u-turning out on Blisseys switching in. The only notable mon that naturally outspeeds dragapult is zeraora, but zera cant OHKO with knock and risks taking a wisp in return, severely compromising zera's effectiveness (of course it does hinder pult a lot as well, so it must be evaluated if the trade is worth taking).
A+
Ferrothorn
Garchomp
Tornadus-Therian
Tapu Lele
Tapu lele is the only one here that isn't A+ in the actual vr. I think it is definitely one of the most potent wallbreakers in the tier that can't be switched in on at all if it predicts correctly. You could make the argument that its prediction reliance makes it belong more in A but I would counterargue that it is extremely rare for a prediction reliant mon to have a way to severely punish virtually every single switch in possible. It has a middling speed tier as well but I think that is more just what stops it from being outright broken.
A
Toxapex
Tapu Koko
Corviknight
Rillaboom
Slowking
Kartana
I put pex in A tier but I still think it's a top 10 mon in the tier, I just don't think it is by any means unbreakable because it doesnt really hard counter any of the offensive A tier mon, although it can still be a significant annoyance to a lot of them. Other than pex I don't see a need to justify any other picks here, they are all strong metagame shaping presences that should make sort of contribution in the majority of games, but they don't quite have the ceiling and/or the consistency of the mons in A+.
A-
Hydreigon
Slowbro
Zapdos
Kyurem
Zeraora
Hippowdon
Mandibuzz
Tapu Fini
Nidoking
Blissey
Latios
Clefable
Slowking-Galar
These mons are all strong and have well-defined niches, but generally can't force progress as effectively as the mons in A and won't necessarily be a strong presence in every single matchup. Hydreigon and Latios are both great offensive breakers but I find they get worn down fairly easily due to life orb and stealth rock chip, and their mediocre defensive typings and stats. Their u-turn weaknesses and latios' knock off weakness also makes it harder for them find opportunities to come in. Zapdos in A- instead of A might be controversial but I find that it is extremely easy to get a knock off off on zapdos and then its defensive capabilities get severely reduced. Edit: Forgot to mention that Latios can run trick sets as well, and that can be a great option but it is also dependent on timing the trick correctly.
B+
Excadrill
Tyranitar
Urshifu-Rapid-Strike
Crawdaunt
Volcarona
Magnezone
Skarmory
Dragonite
I think all of these mons are quite viable but I don't view any of them as having a significant role in shaping the metagame (except maybe excadrill, but it struggles offensively in many matchups), which is what should be used to separate the A tiered from the B tier mons.
B
Dracozolt
Melmetal
Scizor
Tangrowth
Aegislash
Regieleki
Reuniclus
Weavile
Swampert
Barraskewda
Victini
Kingdra
Pelipper
Blaziken
Tapu Bulu
Gastrodon
Volcanion
Thundurus-Therian
These mons all fit nicely on certain team styles and can be very strong in some matchups but they are generally held back by some notable flaws (such as regieleki struggling to make any progress while electric immunes are alive and Blaziken having severe 4MSS), have a somewhat narrow niche or are dependent on team support to function. Volcanion is the one that made the biggest jump up from the actual vr, being in C rank there. I moved it up because of how potent of a breaker the specs set is on rain, but didn't place it higher because its potency all but disappears on non-rain teams on other team styles and it has to deal with a crippling stealth rock weakness.
B-
Amoonguss
Kommo-O
Moltres
Suicune
Buzzwole
Bisharp
Mamoswine
Obstagoon
Gengar
Blacephalon
Hawlucha
Rotom-Wash
This tier is where we're starting to get into the more niche category of mons. I wouldn't call any of these bad or unviable but they are awkward to fit onto teams and generally don't have the widest spread of favourable matchups against common cores and styles.
I won't keep ranking into the C tier because I am not familiar enough with most of the uncommon niche mons to rank them accurately.
Landorus-Therian
Heatran
A lot of people maybe wouldn't have put Heatran here because of its lack of recovery and susceptibility to rocks and spikes damage but I think its strengths definitely push it into this rank. Magma Storm trapping sets might be the strongest offensive force against fat teams right now, especially since most mons that can take on magma storm + taunt don't deal with taking a toxic. It's also a fantastic rocker because of its favorable matchup vs the majority of common defoggers (corviknight, mandibuzz, tornadus, zapdos all can't come in it, neither can spin drill). It unfortunately can't run toxic and taunt on stealth rock sets but it can run both and become an even stronger offensive presence if another teammates frees up that stealth rock slot. Also, despite not being able to recover outside leftovers heatran just somehow always finds ways to remain relatively healthy long-term without hesitating to come in on the action.
S-
Dragapult
I ended up deciding on S- here because I felt like Dragapult was too good for A+ but not quite good enough for S. This mon brings excellent speed control to any team, has an excellent defensive typing that gives it decent pseudo-bulk despite its poor defensive stats, and can bring multiple things to the table on teams. As an offensive status spreading pivot it can be extremely annoying for offensive teams to deal with due to the thread of will o wisp or thunder wave, along with a deceptively potent offensive stab combination. Specs sets have a decent degree of versatility in the move slots and also can be extremely threatening for offensive teams to deal with. Toxapex/Blissey/Clefable type balance or stall builds can make dragapult have a hard time initially making progress, but it also has a fairly easy time getting status on toxapex and clef and u-turning out on Blisseys switching in. The only notable mon that naturally outspeeds dragapult is zeraora, but zera cant OHKO with knock and risks taking a wisp in return, severely compromising zera's effectiveness (of course it does hinder pult a lot as well, so it must be evaluated if the trade is worth taking).
A+
Ferrothorn
Garchomp
Tornadus-Therian
Tapu Lele
Tapu lele is the only one here that isn't A+ in the actual vr. I think it is definitely one of the most potent wallbreakers in the tier that can't be switched in on at all if it predicts correctly. You could make the argument that its prediction reliance makes it belong more in A but I would counterargue that it is extremely rare for a prediction reliant mon to have a way to severely punish virtually every single switch in possible. It has a middling speed tier as well but I think that is more just what stops it from being outright broken.
A
Toxapex
Tapu Koko
Corviknight
Rillaboom
Slowking
Kartana
I put pex in A tier but I still think it's a top 10 mon in the tier, I just don't think it is by any means unbreakable because it doesnt really hard counter any of the offensive A tier mon, although it can still be a significant annoyance to a lot of them. Other than pex I don't see a need to justify any other picks here, they are all strong metagame shaping presences that should make sort of contribution in the majority of games, but they don't quite have the ceiling and/or the consistency of the mons in A+.
A-
Hydreigon
Slowbro
Zapdos
Kyurem
Zeraora
Hippowdon
Mandibuzz
Tapu Fini
Nidoking
Blissey
Latios
Clefable
Slowking-Galar
These mons are all strong and have well-defined niches, but generally can't force progress as effectively as the mons in A and won't necessarily be a strong presence in every single matchup. Hydreigon and Latios are both great offensive breakers but I find they get worn down fairly easily due to life orb and stealth rock chip, and their mediocre defensive typings and stats. Their u-turn weaknesses and latios' knock off weakness also makes it harder for them find opportunities to come in. Zapdos in A- instead of A might be controversial but I find that it is extremely easy to get a knock off off on zapdos and then its defensive capabilities get severely reduced. Edit: Forgot to mention that Latios can run trick sets as well, and that can be a great option but it is also dependent on timing the trick correctly.
B+
Excadrill
Tyranitar
Urshifu-Rapid-Strike
Crawdaunt
Volcarona
Magnezone
Skarmory
Dragonite
I think all of these mons are quite viable but I don't view any of them as having a significant role in shaping the metagame (except maybe excadrill, but it struggles offensively in many matchups), which is what should be used to separate the A tiered from the B tier mons.
B
Dracozolt
Melmetal
Scizor
Tangrowth
Aegislash
Regieleki
Reuniclus
Weavile
Swampert
Barraskewda
Victini
Kingdra
Pelipper
Blaziken
Tapu Bulu
Gastrodon
Volcanion
Thundurus-Therian
These mons all fit nicely on certain team styles and can be very strong in some matchups but they are generally held back by some notable flaws (such as regieleki struggling to make any progress while electric immunes are alive and Blaziken having severe 4MSS), have a somewhat narrow niche or are dependent on team support to function. Volcanion is the one that made the biggest jump up from the actual vr, being in C rank there. I moved it up because of how potent of a breaker the specs set is on rain, but didn't place it higher because its potency all but disappears on non-rain teams on other team styles and it has to deal with a crippling stealth rock weakness.
B-
Amoonguss
Kommo-O
Moltres
Suicune
Buzzwole
Bisharp
Mamoswine
Obstagoon
Gengar
Blacephalon
Hawlucha
Rotom-Wash
This tier is where we're starting to get into the more niche category of mons. I wouldn't call any of these bad or unviable but they are awkward to fit onto teams and generally don't have the widest spread of favourable matchups against common cores and styles.
I won't keep ranking into the C tier because I am not familiar enough with most of the uncommon niche mons to rank them accurately.
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