I don't want to sound rude but to me your post seems more like you just want Ogerpon gone because it is good against your favourite playstyle without actually making a valid point as to why it should be banned.
This is a rather disingenuous retort given no one mentioned balance/stall being a "favorite" playstyle of theirs. Just the negative influence OgerponW has vs these styles. Teams are already strapped for slots trying to check the wide variety of big threats as is, and Ogerpon itself is a part of that group of threats, constraining building quite heavily. Either running niche tera types that are worse vs other big threats, or running mons that are worse vs other big threats and thus compromise some element of your teambuilding.
Of course passive teams filled with ground and water types are bound to have a hard time against Ogerpon-W. Pokemon that makes some playstyles miserable have existed for a long time and having blanket checks for offense and HO in the name of Zamazenta and Kingambit is apparently fine so I don't see how Ogerpon being good but not uncounterable as you said makes it broken. Ursaluna also destroys most stalls and no one would advocate for a ban for the reason that it makes an entire playstyle suffer.
This is a really bad argument, and ignores the issue. Also pokemon like Ursaluna still has counterplay found on stall, albeit shaky, and is a very nuanced and flawed pokemon that, while good, is kept in line by those flaws. Wellspring meanwhile is highly splashable and consistent, and heavily constrains the builder. It's not just stall or balance. Even BO needs to build with it in mind needing two checks minimum. It rips up defensive cores which also enables its own teammates as a result. Also please cut it out with Kingambit already. Anytime something comes up for discussion on being broken or potentially broken, there's always at least one or two "but Kingambit survived so this is fine" attitudes.
Concerning Ogerpon, the classic balances nowadays often have Dragapult with wisp/t-wave to heavily cripple Ogerpon. It also has 4MSS so you won't ever find an Ogerpon that runs Trailblaze, Knock Off, Play Rough, Low Kick, Encore, Power Whip, Ivy Cudgel and Swords Dance in a single set. Yes it is strong but it struggles against a lot of things depending on the moves it chooses. The fact that it can't use any item means that it is very weak to hazards, in particular T-Spikes so you could always use them on Glowking. Also, no matter what moves it run, it will always struggle against bulky grass types so you could either use that or use Tera Grass.
Weird how you doubled down on the 4MSS argument despite what Ian said which quite solidly defeats it. Ogerpon is hugely threatening to these slower teams because of its moveset diversity. Try scouting and you'll risk either a knock off, making your check super vulnerable to hazards, you risk giving Ogerpon an SD and then that check just dropping because so little defensively can eat a +2 Ivy Cudgel/Power Whip without being either a niche pokemon or running a bad tera type on a good pokemon. You're also ignoring how polarizing the different sets are. So much of counterplay just loses if it runs Play Rough, and the stuff that beats Play Rough sets (which isn't much) loses to other variants. There is nowhere near enough overlap in the builder defensively speaking. Also for Bulky grasses? The only good one is Bulky Rilla, which unboosted is weak as shit and can just die to a +2 Power Whip with a spike up (Rilla's own terrain literally helping Ogerpon kill it lol irony).
Also, Ogerpon-W making Alomomola players having to think instead of spamming Scald/Flip Turn is a good thing for the tier. Having a good water immunity that can be run on offense (so not Clodsire) is a huge deal for a lot of non passive teams that would otherwise have almost impossible match ups against rain or pokemon like Walking Wake. (Yes Ogerpon gets destroyed by DM but it can at least force some kind of mind game if you have a fairy on your team).
Try making a noban argument of a balance breaker without complaining about balance pokemon challenge (impossible).
How is it good? There are many perfectly healthy stops and punishes to Mola that don't involve a broken pokemon. And yeah it's got cool defensive utility for offense. Doesn't matter though if what it does to the metagame isn't healthy overall, and it's not. It's one of many difficult to handle threats, and it's, imo, at or near the top of that list right now.
I'll just conclude by saying that not having Ferrothorn and Tangrowth sucks but there are still a lot of options to easily deal with Ogerpon for non offensive team and it's just up to players to try and think a little bit oustide of the box. Without Play Rough, Ogerpon is hard walled by Hydrapple and even with Play Rough it can't even OHKO it at +2 even after rocks so you CAN check its moveset somewhat safely despite what you said.
Lol Ferro is just as abusable by Encore sets. Speaking from experience on that one. And Tangrowth isn't much better. There are not many options to deal with it for non offense, else we wouldn't even be having this discussion. Also unless Hydrapple is super phys invested, +2 Play Rough OHKOs with rocks up. So no it's not much better again, and also it is a niche and difficult to fit mon.