Your logic around 4mss doesn't really make any sense, 'just pick the moves on corv that fits your team structure' you are completely missing the point, the point is Corviknight does not work as a catch all defensive wall because it lacks the move slots to effectively be a catch all on its own. Which was the main argument on it being S-/S recently (not that it's a valid argument). Corviknight having to choose what it beats because it can't either run BB, Press, U-Turn is objective 4mss, you miss out on a ton of value without BB which you say is just fine? Ok what about any of the Ghost or Fairies or glowking or Tera Ghost on the Pokemon meant to lose to Corv or Woger or Ival? I get the idea is just U-Turn but you go into Corv ID prempetively since it usually has to in a lot of MU's and then they get the momentum lead on your anyways instead of immediately pressuring with BB. This is a common situation for no BB corv against things like Woger, hence why BB is used. Also Corviknight is typically alive in the endgame because it's just a long last Pokemon, so having it be mono Press + U turn is generally pretty risky unless you are sure you don't need Corv to win your end games usually. We have ALL been there were Corv + 1 guy is left in the endgame and we wish Corv had Brave Bird lmfao. Also I generally disagree with the sentiment of you have U-Turn so you cannot be beaten even though you lose the MU. Yes you can, it's called the opponent positioning in a way to force your defensive mon to use utility in recovery or setup. This isn't a "skill issue" or make believe either this is very common, it's not hard to force these situations I mean ABR has been forced to click roost un-wantingly before probably 20,000 times, and if you cannot threaten people trying to punish you for that then it's gonna be an issue.I can't really agree with the 4MSS argument - this just seems like something where you pick the moves that are more favorable for a given team composition. If I'm running ID Zama or another KG check on the team, it can be easier to opt for Brave Bird for the Ogerpon-W / IV MU, while if I'm running some other Oger Checks like Pult or Raging Bolt + something like Gking for Valiant, ID + BP will be easier to run. Personally I think Defog is just bad on most Corv teams barring something like hardcore stall or certain Kyurem teams, as removing your own hazard pressure just feels bad, but it is a move you could feasibly run on BB sets or on teams where momentum isn't as important. And of course there are a few other moves like Iron Head, Theif (gimmicky tech I saw once where Corv could steal something like Boots from another Pokemon after getting Knocked), Spite, etc. but most of this is extremely fringe / niche. I think the standard ID / BP / Roost / U-Turn set gets by in most cases, isn't significantly worse vs Ogerpon-W, and mostly just loses to Valiant (which is mogged by other mons on a Corv team typically).
I am aware you brought up the point of how Corv gets helped by its teammates in this regard, but this sort of symbiosis exist with most of the S-Rank mons. Zama isn't just farming everything with ID + BP - it will have some key weaknesses with its various sets depending on what it runs in its last slot. Yet it accounts for that with help from its teammates. Both of Gliscor's offensive and defensive sets are also similar - SD sets are only so strong because of the external support they have and support sets face a simlar dilemma where you want a billion moves like Toxic, U-Turn, EQ, Knock, Protect, Spikes, Rocks, etc while also having some issues walling a few mons like Raging Bolt or Tusk, but these weaknesses are covered by its teammates.
Also you're reasoning for why Corviknight isn't 4mss is extreme strawman, "Defog is bad because you remove your hazards", yeah that's been a thing for the past 13 years. Hazard pressure is still very strong whether you use Defog or Rapid Spin? You have to time Defog just like how you have to time your Rapid Spins anyways, and it's not like defogging is a net negative for you, it just means you accept the damage trade of hazards on your end vs the opponents end. The game state returns to neutral, there is no individual loss besides not having Rapid Spin which always comes with a tradeoff which means there is no 'just do x instead its better' (paraphrasing). There are less spinners usually and the spinners that are in the game have less longevity than the defoggers and it's generally blocked more often than Defog, even in Gen 9 I'd argue it's blocked as much as Defog due to Tera Ghost/base ghost in the tier, this is the general tradeoff. People have used Defog on even hazard stack in tournament for the past 13 years and have been literally fine, defogging your own hazards to reset the game state in order to have a more favorably position later on does not hinder you. Also this is assuming you are even using Corviknight on hazard stack teams, and here's the usage stats for reference
As for the other point, the Pokemon in S- all have good synergy with other Pokemon. This does not at all mean they cannot get high amounts of value on their own, you didn't say this but this is what your reasoning boils down to. In fact you literally admit what I am saying here when you said and I quote "The point about it being less explosive than the other S-Ranks is a bit more compelling since most of them can be very threatening to certain arcehtypes". What I was saying was Corviknights viability comes solely from how it's able to support defensive cores by picking specific Pokemon to beat very consistently, and having it's teammates pick up on the Pokemon it can't beat due to moveslot restraints. All of the Pokemon in S-/S however *can* work very well independently both defensively and offensively. You are implying that the Pokemon only have their S- value due to the teammates support and while teammate support helps, I think we can all agree that Dragonite, Zamazenta, Gholdengo, Gliscor, Kingambit, Great Tusk, and Ting-Lu can do very well for themselves with minimal support in majority matchups. Even in bad matchups Zamazenta has counterplay with Crunch drops or Tera + Sub on ID sets with Body Press outdamaging resistances. Gholdego with Trick or Thunder Wave Crippling or Tera, I could go on. The Pokemon can handle their own issues pretty decently, Corviknight outright loses with no real other outs and this is all ignoring teammates who could make Pokemon like Zamazenta or Dragonite or Gholdengo even more insane. The S- Pokemon like having support because it exemplifies their already great strengths, admist their pretty small list of weaknesses, and also because they just can even if they don't have to be supported greatly to do well. Corviknight REQUIRES the correct defensive teammate support to get mileage. You can't plop Corviknight on a lot BO structures for this reason, it has to be deliberate in builder when used.
As for Gliscor 4mss point, it does suffer from it but not in the same way Corviknight does. Corvknight's goal is defensively walling Pokemon, Gliscor naturally does this with Poison Heal and it's typing. Gliscor has 4mss in it's utility options as of course you want all those nice moves, however this does not hinder Gliscor as a defensive Pokemon. There's very very few scinereo's where Gliscor's 3 move choices does not work for a given situation because Knock Off, Facade, EQ, Toxic, U-Turn value combined is just ridiculous. Corviknight however does have to give up certain matchups when determining it's moveset, unlike Gliscor who functions the same defensively regardless of moveset in like 95% of cases, and that 5% atp is just the normal usual variance. I'd akin Gliscor's 4mss similar to Mandibuzz 4mss where you already defensively handle what you want no matter what but you have to choose between which cake to eat, in regards to the utility moves.
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