Alright, time for another good round of hot takes from UU player Smallsmallrose. Lets start off with a bang, shall we?
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Seismitoad and Rhyperior: C+ > B-
Swampert: B- > B
These 3 here are seeing a lot more value with Rotom-H being an extremely common defogger. Rhyperior, Swampert, and Seismitoad can all battle the oven quite easily by resisting most everything it can do and sustaining rocks against the hyper role-compression defogger, making them extremely powerful against balances that rely too much on Rotom-H's defog. They're also a lot more effective lately due to Manectric's rising preference for Non-HP grass. Signal Beam and HP ice have been seeing a lot more use in higher level play due to the dragons and Gligar, so it's less likely the Mane will have a move for this troublesome trio.
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Gengar to A-:
As long as people continue to not use things like A-muk and Lax, teams will continue to fall over to Subgengar. Scarfed Krook and Hydra are rather mediocre answers to this mon at this stage. They can't switch in because Gengar will just sub up on the predicted switch, KO them, and then probably take another KO. And they struggle to revenge kill if a sub is up as well. If Gengar is given a free turn, it's utterly terrifying for anything less than the fattest teams. This mon not only appreciates Terrakion's omnipresence scaring off all the super thick normal and dark special walls that can battle it, but also appreciates it's speed tier being able to pick off Terrak. Gengar has cemented itself as quite a haunting pick in our current metagame, and I think A- suits it perfectly.
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Blastoise-Mega to B+:
This mon has been picking up steam as a fantastic spinner and a hard-hitting water that a number of bulky teams can struggle with. Many trends like the dominance of things like Slowbros, Latias, Hydregion, Empoleon, etc. have made it stick out over similar options like Volcanion for it's unique ability to pump up it's dark pulses and aura spheres with Mega Launcher. It can also splash ice beam in there for things like Mega Altaria if needed. It's been a respectably popular mega lately and I think it deserves to finally come out from under the radar in it's VR rank.
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Altaria-Mega to A+:
Speaking of popular Megas, this is arguably the most popular one right now. With the refresh DD sets picking up tons of steam and Altaria in general being a massive nuisance to many balance builds, as well as it's fantastic matchup against a number of hot meta picks like Kommo-o and Hydregion, this thing deserves to rise to A+. It's an incredibly versatile pick with many sets and many variations on those sets. Absurdly customizable spreads and a huge movepool are Altaria's game. While it's far from unbeatable and there are certainly mons that can battle most of it's sets consistently, its positives outweigh it's negatives to a degree that A+ would show.
I suppose I'll make some remarks on a couple of other people's proposals while I'm at it:
View attachment 162163to UR: Disagree. it's passive nature means nothing when most of the teams it's used on are horribly passive anyways and usually build with the idea in mind that Registeel may be used as setup fodder, and will have answers to anything that sets up on Regi. I think it's a fine pick for any stall wanting to use a Mega that isn't a steel, like Slowbro or Altaria stalls.
View attachment 162164to C+: Agree. It's a strong attacker that can set up hazards or just launch of attacks scarily well against more passive teams, and offensive grasses are a bit of an underrated pick in general right now as many offensive grass checks have been a bit zoned out with the leave of Serperior, Breloom, and Venusaur. Roserade is one of the mons that takes advantage of this very very well.
I'm mainly here to comment on your Registeel pointout, saying that you disagree with that point. However, there are some things that I disagree with when you pointed out reasons why this shouldn't drop.
First off, it has exploitable weaknesses to common types here in the metagame. Keep in mind that stuff such as Terrakion, even though it's weak to its Seismic Toss, can and likely will retaliate with a nasty combo of SD+CC. (Swords Dance+Close Combat). CB Terrakion is also able to OHKO with Close Combat, and Choice Scarf Terrakion can also 2HKO with Close Combat. Its low speed means that it gets outsped by pretty much everything barring Rhyperior, which is already at a low point anyways. Besides, Krookodile 2HKOs it with EQ, and can cripple it with Knock Off, while Registeel's Seismic Toss is only a 4HKO on Krookodile. Kommo-O hits it hard with CC, the mixed set can hit it hard with Flamethrower or Close Combat, and Close Combat 2HKOs Registeel, and after a boost, that can and will OHKO Registeel. You see the problem? Mega Aggron isn't gonna take as much as Registeel, and neither is Mega Steelix.
Second, it faces a lot of competition from Mega Aggron and Mega Steelix, since they're not as passive and have better abilities. Besides, the only reason you'd even run Registeel over the otherwise superior mega evolutions is because of the ability to hold Leftovers and less opportunity cost. And that's pretty much it. They aren't as vulnerable to Knock Off as Registeel, they don't rely on passive damage to hit their foes, and simply put, they are better in the fact they provide more to the team. In fact, Mega Aggron and Mega Steelix can provide some offensive roles, while Registeel is stuck on stall teams. Shit, I'd even give Blissey more credit due to her larger utility movepool and ability to cure status on the go. Sure, it's more vulnerable to physical attacks, but doesn't even need to worry about Knock Off crippling it thanks to Soft-Boiled.
Moreover, even if there is something that will check the threats that set up in Registeel's face, there will always be something to break whatever's in front of them. For example, if Registeel switches out into Mega Altaria, predicting a possible CC to the face, Kommo-O is likely gonna use Poison Jab to surprise the opponent. And what's even worse is that Mega Altaria is slower than Kommo-O so it's not gonna be able to get up Dragon Dance itself before it dies. Slowbro and Altaria stalls aren't even that good either. Slowbro dies to Hydreigon's Dark Pulse, Primarina's Energy Ball, pretty much any super effective special attack in general. Mega Altaria, while it indeed becomes bulkier upon mega evolving, is SUPER slow and its typing is HUGE Scizor bait. It's even bait for opposing Mega Slowbro packing Ice Beam. They're prone to easily dying, and although they have reliable recovery, they're not gonna be able to use it due to their shitty speed tiers.
Just to be honest, the meta doesn't like Registeel right now. In fact, I think it's really bad. It's essentially a wall that lets down its team since it gets worn down easily, it's weak to common attacking types here in UnderUsed, and gets crippled by Knock Off. It had its niche, but I think it's lost it right now.
*Edit: Even if Registeel's huge special defense makes it appealing, its lack of recovery and weakness to common types in Fire, Fighting, and Ground let that down. I could say about half the same things about Mega Aggron and Mega Steelix, however, they have simply more to offer to a team than Registeel. Mega Aggron can dish out some damage with Fire Punch/Earthquake/Heavy Slam while Mega Steelix can do the same with Gyro Ball/Earthquake/Heavy Slam.
Registeel can check Latias - but so can Mega Aggron and Mega Steelix. Sure, Mega Aggron has to watch out for a boosted HP Fire, but other than that, it can come in safely and retaliate with Heavy Slam - or better yet, Ice Punch. Mega Steelix gets 2HKO'd by HP Fire, but can and likely will OHKO with Gyro Ball. The Electrium Z set is rendered useless versus Mega Steelix, and even Gigavolt Havoc fails to deal sufficient damage to Mega Aggron. The CM set fails to do much versus Mega Aggron and Mega Steelix, and the Choice Scarf set is rendered almost useless since mega stones can't be tricked onto another pokemon.
They are able to check Latias, Hydreigon, and Scizor very well, but they don't check Latias as well as Registeel does. Hydreigon's Fire Blast fails to 2HKO Mega Aggron. Mega Steelix does get 2HKO'd by Hydreigon's Fire Blast, but it can 2HKO in return via Gyro Ball. Hydreigon's Defog set doesn't threaten Mega Steelix or Mega Aggron at all, so they can hit it hard with Gyro Ball and Heavy Slam, respectively. Taunt is annoying, but again, Mega Aggron doesn't care. It can and likely will retaliate with Heavy Slam, or if the set runs it - Ice Punch. Of course, the Choice Specs set is troublesome, but keep in mind that Fire Blast doesn't hit all the time. If it misses, (I've seen it more often than not, believe me) then Mega Aggron can 2HKO with Ice Punch or 3HKO with Heavy Slam. Mega Steelix has to worry more about getting OHKO'ed by Fire Blast, but again, if it misses, Mega Steelix can retaliate back with Gyro Ball, which will likely OHKO it. The LO set is a bit more annoying, but again, that, unlike Choice Specs, comes at the cost of 1/10 of your HP per turn, and this isn't able to 2HKO Mega Steelix, so Hydreigon has to worry about getting OHKO'ed by Gyro Ball. Every Scizor set dies to Mega Aggron sets that run Fire Punch and to Fire Fang variants of Mega Steelix.
Registeel is only able to deal with Latias, and other than that, it fails to check Hydreigon and Scizor, both of which are able to retaliate back with their own super effective coverage.
Noms that I support:
to B-
to B-
to B
to B+
to A+
to A-