update:
rises
A -> A+: Flygon has firmly established itself as at worst the second best utility Pokemon in NU. Between its Choice Scarf and defensive sets, Flygon offers a slew of great benefits to teams, including U-turn, Defog, a Volt Switch blocker, and an Earthquake immunity. Additionally, with Gastrodon recently rising to RU, more and more people are relying on Flygon to be that Electric-immune and Rock-resistant option on their teams.
A -> A+: The other contender for best utility option in the tier, Talonflame continues to see insane success. Its a great Copperajah check and very effective at spreading status, helping it disrupt opposing teams. It generally offers teams a lot of options for utility, with Defog, Taunt, U-turn, etc. all being great options depending on your team. Furthermore, its great speed enables it to be a revenge killer for certain frail threats such as Salazzle.
A- -> A: Blastoise is the single most threatening setup sweeper in NU. Very little can offensively answer it after a Shell Smash, and not many Pokemon that can take a +2 attack from it can actually threaten anything in return. It requires very minimal support to perform at a high level and is a threat you must always be cognizant of while teambuilding because of how little it needs to run roughshod over teams.
A- -> A: Sirfetch'd greatly benefits from NU's lack of great Fighting-type checks. Because of how strong its Choice Band Close Combat is, even options like Sylveon and Mudsdale can find themselves quickly overwhelmed by it, with the former being 2HKOed with slight chip damage. Previously solid checks to Fighting-types like Vileplume and Mantine simply aren't consistent anymore because of Sirfetch'd's power and coverage.
B+ -> A-: The glizzy guzzler continues to be a strong presence in the metagame as one of the few durable Ghost-resistant options we have. Toxic-stalling sets are great at slowly breaking down common switch-ins like Mudsdale and non-Heal Bell Vaporeon, while Choice Band ones are excellent at making use of pivots that draw in the prevalent Steel-types---Copperajah and Bronzong---of the tier.
B+ -> A-: Similar to Sirfetch'd, Machamp is very difficult to reliably switch into because of how strong it is after Guts is activated. It's very easy to pair it with several pivots and make up for its poor defensive utility, giving it plenty of opportunities to switch in and wallbreak.
B+ -> A-: Mudsdale has gotten a bit better recently with the rise of Gastrodon, allowing it more places on teams as a Rock-resistant Pokemon that can also handle common wallbreakers like Sirfetch'd, Guzzlord, and Silvally-Ghost.
B+ -> A: Vaporeon is one of the rising stars of NU currently for good reason. It's one of the few consistent answers to offensive Water-types like Starmie and Blastoise, with the latter also being bothered by Roar variants that disrupt its attempts to set up and sweep. Vaporeon synergizes excellently with other common Pokemon like Mudsdale, Guzzlord, and Copperajah that desire its Wish + Heal Bell support, and wallbreakers can really benefit from Flip Turn support.
B -> B+: Heliolisk has mostly seen an increase in usage lately due to its Choice Scarf set, which lets it outpace +2 Blastoise and threaten heavy damage with Thunderbolt. Unfortunately, its niche is rather limited outside of this.
B -> B+: Xatu is pretty much the go-to dual screens setter for hyper offense teams and enjoys Mudsdale's increase in usage, being able to easily block its attempts to set Stealth Rock.
B- -> B: Aerodactyl enjoys there being one less Pokemon to wall its Stone Edges and is the naturally fastest viable option in the tier, giving it great leeway against teams that rely on Pokemon like Talonflame and Salazzle as their revenge killers.
B- -> B: i could not tell you why this is getting a rise 
B- -> B: Tauros is a fairly consistent wallbreaker thanks to its coverage and speed, and the ban of Cresselia, while distant, has benefitted it a bit by opening up its fourth moveslot more, as Work Up is no longer as mandatory. This lets it run a coverage move like Iron Head to better deal with Diancie.
B- -> B+: Toxicroak greatly appreciates the surge in Vaporeon usage, as it's quite literally the freest switch opportunity of all time. Additionally, it's a fairly okay soft check to Blastoise, being able to stomach even +2 Ice Beam and retaliate with an attack of its own.
B- -> B: Weezing is a good defensive answer to wallbreakers like Machamp and Guzzlord, with the former especially struggling against Neutralizing Gas variants. Additionally, although grounded-Poison-types are common, Toxic Spikes can be situationally excellent to have.
C+ -> B-: Focus Energy + Agility Kingdra absolutely loves the current metagame trends, particularly the rise of Vaporeon. Although it can be hard to find a chance to use both moves, very little can stop this set from taking over games late.
C -> C+: Golisopod and Roserade leaving means Garbodor is the only viable Spiker available now; it's also an okay answer to Sirfetch'd and Machamp, being able to force great chip damage on them with Rocky Helmet + Aftermath.
drops
A+-> A: Sylveon remains an excellent pick, but with Vaporeon rising, its place on teams looking for Wish or cleric support is a bit less secure. It's also no longer as effective of a Fighting-type check due to past metagame changes.
A+ -> A-: Vileplume is really struggling nowadays because it offers much less defensively than it used to and is much easier to take advantage of with Pokemon like Salazzle and Dragalge.
A- -> B+: Decidueye's place on teams has become much less secure with the bans of Cresselia and Snow Warning; it was a great answer to the former and a mainstay on auto-hail teams. Additionally, Guzzlord's rise is troublesome for it.
A- -> B+: Similar to Decidueye, much of Escavalier's viability stemmed from the presence of Cresselia and Snow Warning, as it was excellent defensive counterplay to such threats.
A- -> B+: Vaporeon is becoming the go-to defensive Water-type for teams, and there exist many other Defoggers that offer a more active role than Mantine, which has made it harder to justify nowadays.
B+ -> B-: Zoroark has failed to establish a solid niche for itself. Wallbreaker sets haven't proven to be very consistent, and although Choice Scarf ones have seen some recent success, they haven't helped Zoroark become an NU mainstay.
B -> B-: Comfey can very frequently become near-deadweight because of how common Pokemon such as Copperajah, Salazzle, and Talonflame are. Although it offers a lot of team support through Defog, U-turn, and Natural Cure, it's generally better to seek these roles through more viable options.
B -> B-: Ninjask is much less effective in current NU than it was in the Snake Draft metagame. Pokemon like Copperajah, Diancie, and Flame Body Talonflame make its life hard, and there exist many more options for speed control nowadays, meaning Ninjask doesn't have as much of a stranglehold on the Speed tiers as it used to.
B- -> C+: Terrain teams are very niche, so Alolan Raichu falls into the territory of very niche options.
B- -> C: The ban of Snow Warning has heavily neutered Arctovish's viability. Although manual hail teams have popped up a bit, they're not anywhere near as viable as what we saw last month.
B- -> C: Centiskorch was previously ranked for being a good defensive team breaker that also could take down Cresselia. With Cresselia's ban, Centiskorch has much less of a reason to be used.
B- -> C: Xatu has essentially usurped Espeon of much of its previous purpose, and offensive sets will always struggle with Copperajah's omnipresence. While it's not unviable by any means, Espeon is very hard to justify using over other options that typically do what it wants to better.
B- -> C+: Psychic Terrain isn't anywhere near a mainstay, and as a wallbreaker, Indeedee-F hasn't impressed.
C+ -> C: Seldom sees use, Blastoise is the better Shell Smash user, and Vaporeon's surge basically removes any reason to use it. I would not be shocked to see it unranked next update.
C+ -> C: Electric Terrain is not very great, although it certainly remains a usable, albeit niche, hyper offense option.
(fairy) C+ -> C: Silvally-Fairy is mostly just inferior to Silvally-Ghost, which is much more difficult for teams to reliably deal with due to its superior Multi-Attack.
C+ -> C: Sneasel struggles to provide players with a reason to use it. Its fragility makes it incredibly easy to revenge kill, and it's not particularly strong relative to previous metagames in which it was a dominant force.
C+ -> C: Vikavolt just doesn't see meaningful use.
new
-> C+: Arctozolt has a really obnoxious dual STAB combination but suffers from being rather limited outside of hail because of its poor Speed tier.
-> C: Expulso's post explains well why you'd use it. For now, the VR council is being cautious with our ranking of Scyther because it's pretty uncommon, but if it sees more success in the near future, then it could see a greater rise.
unranked
:( Rotom-C supremacy and lack of usage to justify ranking it any longer.
This has not been used in a serious capacity since mid-2020.


Snow Warning ban makes these unusable.
Other Pokemon do literally anything it can do but better.
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