This is something that I've been thinking about for the past few weeks, but in light of people's views on the current CAP meta and the ongoing Gliscor suspect, I have decided to finally post about this. I believe that
CAP should start tiering separately from OU. Let me explain:
It should go without saying that the current gen CAP metagame is quite a bit different from OU. As CAPs continue to be designed around the CAP metagame and continue to be released, I find that the difference between CAP and OU will only continue to increase over time. As such, it is only sensible that CAP makes tiering decisions based on the state of its own metagame rather than that of OU's. This has already been done with the banning of Clefable in Gen 8 Pre-DLC, and with Walking Wake's ban in Gen 9 Pre-DLC. Yet, few seem to support such action when it comes to unbanning certain pokemon in CAP that OU has banned/will ban. While in general most pokemon that OU bans are also similarly broken in CAP, it would be disingenuous to expect that is always the case given the difference in the two metagames. As such, I find it to be in the best interest of the CAP metagame to consider some pokemon that have been banned/will be banned and evaluate if they may actually have a beneficial influence upon the CAP metagame:
In OU Gliscor is currently that guy, and while still strong in CAP, is not nearly as broken. Notorious for its capability to get up Spikes in OU, CAP is no stranger to strong Spikers with options such as Arghonaut and Hemogoblin. Conversely, CAP suffers from a middling pool of viable Stealth Rockers, with Venomicon being basically the only Rocks user that doesn't feel awkward to run. Consequently the standard Spikes Gliscor set isn't able to fit nicely into CAP teams as it does into OU, especially when you consider its matchup into Equilibra, the best removal in the tier. As such, when building with Gliscor in CAP you quickly run into a serious 4MSS issue. Between Hazards/EQ/Protect/Knock/Toxic, Gliscor always feels like it is missing something when only running 4 of these 5, making it far less oppressive than it is in OU. Gliscor is still extremely annoying to fight, but I find far from broken or unhealthy in CAP.
Furthermore, Gliscor's unique defensive properties enable it to be a solid answer into the more oppressive CAP threats and provide a significant amount of flexibility in defensive teambuilding to where banning it from CAP would be a detriment. First, the increased prevalence of Knock Off in CAP, whether from Arghonaut or Venomicon, means that adding a dedicated Knock absorber for the team provides a lot of breathing room for the team. Gliscor's capability to come in on Arghonaut and threaten Toxic, or come in on Venom lacking Hurricane and threaten to get up Spikes makes it a reliable switchin to the defensive bastions of CAP that most teams struggle to switch into. In addition, Gliscor is one of the best answers to Hemogoblin in the tier due to its natural bulk and naturally higher speed. This capability, in addition to its general physical bulk, hazard-setting capability, and Flying typing, makes Gliscor a genuinely strong alternative to Venomicon on a lot of teams, helping to decentralize the metagame from the book. In doing so, Gliscor is able to function as a glue for several bulky offense builds while diversifying the options for balance builds, which overall I find to be a healthy presence for CAP.
While not currently on the chopping block, it would be far from surprising if Gholdengo is suspected in OU in the near future. Although Gholdengo is certainly a strong pick in CAP, it again is far from broken in CAP. Even with Air Balloon, Gholdengo struggles into Equilibra long-term, and Nasty Plot typically fails to break past Arghonaut in any meaningful way. Its poor matchup into Equilibra makes its spinblocking capabilities far less potent in CAP, especially since it also struggles into more niche removal like Mollux, Colossoil, and Astrolotl.
Outside of spinblocking I don't think anyone would argue that Gholdengo's other attributes are broken or unhealthy for the metagame, whether that be CAP or OU. In CAP specifically, Gholdengo relieves a lot of pressure in the builder with its ability to consistently hard switch on Venomicon lacking Knock Off, while also functioning as an offensive pokemon that resists Hemogoblin ExtremeSpeed. While the list of things Gholdengo provides in the builder isn't as extensive as Gliscor's, the singular ability to stuff out Venomicon makes it an actively healthy presence in the metagame in my eyes.
Now I want to talk about some previously banned pokemon that I think we should consider unbanning:
Pre-DLC Baxcalibur was near broken in OU, but suffered from a number of challenges in CAP, specifically beating Arghonaut and Hemogoblin. This made Baxcalibur a strong pokemon, especially with Chilly Reception, but often awkward to fit on teams. Following Teal Mask, Baxcalibur received 2 new tools: Scale Shot and Alolan Ninetales. The former does little for Baxcalibur in CAP. A reliance on Loaded Dice makes Baxcalibur much more vulnerable to Knock Off, but more importantly, a reliance on multi-hit moves makes Baxcalibur far weaker into Venomicon, which Baxcalibur should otherwise be able to beat. Then the Defense drop from Scale Shot only makes it easier for Baxcalibur to be revenge killed by Hemogoblin, and the capability of using Swords Dance instead of Dragon Dance doesn't improve anything into Arghonaut. On the other hand, the addition of Alolan Ninetales may not be so trivial, but nonetheless I think Baxcalibur will remain a relatively stable presence in CAP. Again, Screens does little to help against Argh, and with the incoming release of CAP33 teams will have yet another option for a reliable Baxcalibur answer. Generally, the counterplay to Bax under screens remains the counterplay for regular screens offense where you try to limit the amount of screens turns as much as possible.
Whether unbanning Baxcalibur will be ultimately better for the metagame is still questionable, but I think at the very least should be considered. Notably, Baxcalibur is one best Krilowatt answers you could ask for; pairing Bax with any Ground is often sufficient to answer the shrimp. More importantly, the metagame could potentially benefit from a strong offensive Ice type of which there are currently none. Currently there isn't much that can muscle past both Flying types and Ground types bar Krilowatt, to which I think Baxcalibur could add some more diversity in offensive options.
Palafin never really got its chance in CAP since it was banned before Gen 9 CAP went live, but I believe Palafin may have the potential to be balanced in CAP. This one I'm less serious about but I think Palafin could be funny so just humor me on this one. For starters mono-Water STAB isn't amazing currently, going against pokemon like Arghonaut, the impending CAP33, Ogerpon-Wellspring, Walking Wake, and more. This renders the Choice Band set to be extremely prediction-reliant and overall inconsistent. But the real threat that got Palafin banned was the Bulk Up Set. Bulk Up sets should be easily stuffed out by Arghonaut and CAP33, but even without these two answers like Ogerpon-Wellspring, Krilowatt, and others seem serviceable. I could imagine Bulk Up Palafin being on a similar power level to something like Manaphy, which I find sits comfortably at a level of balanced with cheese potential. Overall I can't really say for certain that Palafin won't be broken in CAP or that it would even benefit the meta by adding it, but I think it would be funny if we had him.