Ogerpon-W at least has to get sequencing right vs Desolate Land mons - MANY of which shrug off its Grass-STAB and secondary coverage. Cincinno has counterplay with Stamina, but those stray hits from Rock Blast / Bullet seed aren't being completely invalidated like Cudgel would be against desolate land mons, yknow.
All that said, with how overcentralizing Corviknight and Pecharunt are (even moreso than Gen 6 Aegislash or Gen 3 Skarmory tbh), banning an honest breaker that gives teams a fighting chance to break through these Pokemon is not the way forward. We should be focusing more on unbans to Pokemon like Roaring Moon or Gholdengo, which can help check Cincinno while allowing for greater diversity in the metagame by also helping against Pecharunt / Corviknight.
I struggle to see Cincinno as an honest breaker due to the fact that it is so utterly devoid of switches. Stamina mons would much rather have another ability and Pecharunt is forced to recover the second it takes any damage, leaving a free switch for the opponent, lest it get 2hko-d by rock blast on the switch. Even something such as specially defensive heatran is forced out on account of how it gets ohko-d by rock blast from full. Additionally, I fail to see how Corviknight and Pecharunt are so unbreakable otherwise. Pecharunt is incredibly passive to any steel type, easily is knocked by what it walls leaving it vulnerable to hazards, and corrosion Pecharunts deeply miss the defensive boost from an ability leaving it much easier to break through. Corviknight's lower bulk makes it struggle to be a reliable physical wall without fluffy and struggles to keep hazards off consistently unless it beats your hazard setter (but we freed gapdos so free punish right there). SD Hamurott breaks through both, SD Chomp is immensely threatening to both unless it is WBB but even +2 scale chunks it hard and combined with Rough Skin recoil leaves Corv very weak if it uturns out to a Revenge killer, and corv doesn't threaten chomp very much so there is the looming threat of getting a second SD. SD Lando also heavily wears Corviknight down albeit not being as good into levitate pecharunt. Taunt on your physical attackers also makes it much easier to deal with, preventing healing and defog. Ace pressures both solidly, with HJK chunking WBB Corviknight and 2hko-ing with a life orb. SD crawdaunt immensely weakens Fluffy corv and kills all other variants. Banded similarly puts immense pressure on Fluffy Corv. SoR Tinkaton makes it dicey for either of them to recover an attack off due to encore, and +2 Giga does a surprising amount to Corviknight. Woger and Rock Oger similarly put immense pressure on both. Mienshao with lorb and SoR deals huge damage to Corv with HJK and knock off chunks Pecharunt for over half, with the added bonus of being intimidate immune. Magic guard cobalion pressures Corv with volt switch or CC, while killing Pecharunt with Steel Beam. Mixed kommoo or physical can put pressure.
Onto mons not on the VR
Iron hands beats Corviknight and if you drop Ice Punch for EQ pressures Intimidate Pecharunt and Tpunch hits Pecharunt hard (Supercell/Wildcharge could be considered since you kill Fluffy corv at +2 with it anyways which pressures levi Pecharunt even more)
There's numerous mixed attackers or slow attackers who tear these apart, such as Mamoswine. Lucario 2hko-s both Corv and Pecharunt with DrainPunch/Mash, retaining a powerful extreme speed to ward off revenge killers. Iron Frauder does a lot to corv if you run SoR stone edge. Lycanroc-dusk hits both super hard with Rocky payload Stone edge backed up by Tough Claws boosted accelerock. Metagross has decent defensive utility and can 2hko corv with tpunch. Infernape could be mixed, physical, special, Mguard volcanion is pretty scary with the added bonus of messing with mola
A lot of mixed attackers can lure in and remove these physical walls, Adaptability Hydro Pump from Samurott hisui 2hko-s without a boosting item or investment and only costs you a moveslot + naive nature to make corv think twice about coming in. Crawdaunt can run sflo with crunch, liquidation, dark pulse, and whatever you want last with pulse 2hko-ing corv with no investment. Mixed gren is scary and imo the best set, Mixed mguard zap is scary to both, Future Sight support wears corv down and scares pecha out.
I think it's just plain misinformation to say Cincinno is what gives teams the ability to break through these mons. There's plenty of mons who do well in weakening both to near death while also not dying themselves, and quite a few who can go mixed and break both. You can also abuse Corv uturns with helmet chip of your own which really adds to wear it down, and Pecharunt can be worn with hazards considering how many of the mons it checks wield knock off. In fact, I see it as defensively teams being hard pressed to fit what checks to the countless offensive threats. Many threats that go mixed just completely melt through even stall, and certain niche threats force certain mons (ie Mamo forcing stamina or a bulky water like mola), vastly limit the options more defensively oriented teams have. A lot of set up sweepers are threatening to teams lacking a solid unaware wall, as these defensive mons struggle to threaten them with meaningful damage and the mons that do have pivoting are often lacking in Regen, meaning that the damage they take to sustain the pivot needs to be healed off the next time they come in. This is also apparent with Regenvesters, with common regenvesters like Reuniclus, Hoodra, (my fav Lu), lacking pivoting and thus while tanking hits well can be worn down or muscled through by set up sweepers while also not forcing the sweeper out by bringing a revenge killer in.
Gholdengo should not be unbanned, it would require Tusk and Treads to run scrappy or mold breaker to not get endlessly spin blocked by Dengo and it would mean that Corviknight anchored teams would be completely suffocated by hazards. Gholdengo is as much as a Cincinno check as Jirachi is, except it has poorer physical bulk and would be an incredibly annoying breaker in its own right.
I can't see how Roaring Moon would be a healthy addition to the metagame, Fluffy ddance sets can invalidate Zamazenta, Tusk, and Chesnaught as checks while also using Corviknight as setup fodder. Regular attack booster SoR would actually hugely boost the usage of Corviknight, as SoR attack booster acro smashes Tusk, zama, and chesnaught. Other resists like Cobalion would be pressured by EQ and Lu is shut down by taunt.
On account of pokemon that are banned I do question why Manaphy was banned. Was Psea set up + rest that restrictive?
