Dealing with Kommo-o: Defensive and Offensive counterplay. I'll be using the standard 252 HP / 252+ Atk and from full for calcs here, with LO as the item.
I'll start with defensive.
- Unaware Scream Tail. While it is the most "boring" counter, it is by far the most viable and the best counter Kommo-o has.
- Defensive Zapdos. Fluffy Zappy takes nothing from all of Kommo-o's bar Rock Slide, but Rock Slide isnt too common rn since you want PJab to beat non STail fairies and EQ for Pex.
Fluffy Corv. Thunder Punch does 2HKO Corv, but it does allow you to pivot into whatever offensive Kommo-o check you have. Corv doesnt actually check Kommo-o lol
- Some form of skele that doesn't take a million from EQ. --> can will-o-wisp kommo-o but you gotta pray it isnt Rock Slide.
Offensive counterplay now.
- Azelf. Any and every Azelf completely shut down Kommo-o while also chunking it (if on screens, outright OHKO if screen-less for scarf, specs always ohkoes)
- Armor Tail Polteageist. Very HO-specific mon, lovely.
As you can see, the list of counterplay can be counted on one hand. With how easy screens are to get up, it isn't very easy to prevent it from clicking Belly Drum unless your name is Specs BoR Walking Wake but who clicks BD on wake anyways. However the counterplay (barring teapot and maybe skele who isnt super viable rn but still usable) are all very good mons.
This brings me to my next point: Kommo-o is uncompetitive.
Often times, especially on screens HO, you will need to bring in x mon to deal with your opponent's y mon. However, Kommo-o may easily be able to set up on x mon. This turns into a lose-lose situation, where you either find your team being heavily chipped by y mon, or Kommo-o setting up on x mon. Kommo-o being able to pick and choose what checks it makes it even more matchup reliant, amplifying the uncompetitive part of Kommo-o. Although minor, there is also the possibility of Scream Tail getting poisoned by Poison Jab, which shows that Kommo-o can just luck its way through it.
But what differs it from other setup sweepers like Gengar, Thundy, the like? Their counterplay is low too, they hit similarly hard, yet they aren't considered as uncompetitive? Unlike them, Kommo-o has bulk, artificial "speed" from Triage, access to Belly Drum which is much stronger than Nasty Plot, and the ability to self-sustain with a boosted Drain Punch. However, BD's drawback makes it a one-time do-or-die mon, while Gengar and Thundy can NP many times in a game. This difference in power and versatility separates Kommo-o and Gengar's role, Kommo-o being a (usually) one-time button clicker that heavily relies on matchup while Gengar is a more consistent, less MU reliant setup sweeper that can be used multiple times throughout the game to start breaking or to start sweeping.
The difference between banning Kommo-o and banning Triage is pretty significant. Kommo-o by itself has a lot of valuable traits: checking every Ogerpon form, Meowscarada, Cinderace, Barraskewda, list goes on. Banning Kommo-o will cause these mons to lose one of checks and may become more overbearing for the meta. Banning Triage means that some mons completely lose their niche - for now, that's Hatterene exclusively but Enamorus-T will suffer from that big hit too. Conkeldurr / Okidogi seem to be potential abusers of BU + Triage too, they will be relegated to running SoR or smth instead.
Triage is notably controversial, being able to remove progress by forcing out X mon could be considered uncompetitive as it does "limit" progress, but I haven't seen too much discussion on it. I'm interested in everyone's thoughts, what do yall think about Triage and Kommo-o? I personally feel like these two are fine and have sufficient counterplay such that they aren't broken. Competitive-wise I'm leaning towards kinda uncompetitive for Triage and Kommo-o being uncompetitive atm but maybe with meta developments I'll change my mind.
might be missing stuff since it's exam season for me rn but oh well
edit: new team:
https://pokepast.es/6ae58583058a9d66, very consistent, wins against everything if you dont get 2 minrolls with lash out on corv and then missing stone edge or run into competitive sash gengar