I agree that Smeargle is the only broken baton passer*, but there are some people who think that a lot of pokemon could work on denisssssss' geopass team, and if there really were a huge number of problematic pokemon I think a ban on baton passing with more than 1 type of boost would cover all of them with pretty minimal collateral.
*Smeargle is the only broken baton passer under the current system where only 1 baton pass user is allowed. But I definitely believe that a broken 6-bp team can be created without Smeargle (like, Scolipede + Vaporeon + Sylveon + Zapdos + Mr Mime + Espeon is pretty broken imo). Banning baton pass with more than 1 type of boost would kill the chains while allowing us to lift the 1 bp user clause, while banning Smeargle alone would not allow us to lift that clause.
It's true that once we think about raising the BP cap (which is one of my goals), things will start becoming a heck of a lot more complicated, and previously unbroken mons may find themselves a broken niche. I haven't thought too much on how to do this gracefully (which I probably should've), but I think the best way to do this is gradually. Let's start with raising the cap to 2 or 3, see if any broken teams crop up from that, and then move on from there. IIRC, Denis' 3 mon BP team utilized duel screens Deo-S, which is itself a broken mon, not to mention that the meta was very different back then then it is now. So I'm afraid that I cannot predict at this time what raising the cap would do, I can only say that it really should be done, or at least tested.
As for the "large number of people" who believe that lots of mons can work with Geopass, let them provide evidence (or at least arguments) that this is the case. I personally think that they are either bluffing or are allowing their biases to cloud their judgement.
Sergeant Spooky Yes... and we also have people who hate losing to stall for any reason. Disliking a playstyle has never been a reason to ban it or any of the mons that enable it. Being broken, however, is. That is why I have been advocating for Scolipede and Smeargle bans, because I believe them to be broken (I'm starting to have doubts on Scoli though).
I agree that there are certainly issues with figuring out what exactly makes Baton Pass strategies broken, but I don't really think Gorebyss can really pull of BrokenPass nearly as well as Scolipede or Smeargle. It struggles to come in, due to its barely passable (ha i'm so punny) bulk, since honestly 55/105/75 isn't good, and even then has a tough time getting that first boost off because of its low speed. Smeargle and Scolipede both have useable speed (somewhat in Smeargle's case) but Gorebyss has pathetic speed. If you don't switch in on something with either very low speed or something that doesn't threaten Gorebyss at all (which honestly isn't all too much) then Gorebyss will be taking a hit before getting off any sort of boost whatsoever. Even after a SS it still has low speed, requiring a good amount of investment to outspeed offensive mons.
Ultimately I'm not convinced Gorebyss would be threatening enough. Feel free to prove me wrong – I'm not opposed to banning it too if it proves broken – but at the moment I think just Scolipede and Smeargle should be suspected.
EDIT: As for banning Baton Pass, I think it's a really bad idea. It's not uncompetitive (hell CancerPass isn't uncompetitive, just broken) and so banning it would be setting a precedent that we really don't want to set. All other banned moves (Swagger, OHKO, Evasion) make the game more luck based and therefore uncompetitive, but Baton Pass doesn't do that. It just is a part of a few strategies that are ridiculously powerful if set up right. Why not just ban Iron Defense, Shell Smash, and Geomancy? (Don't actually do that.) After all, they're part of the unhealthy strategies of Baton Pass.
You may be right, however there is one thing you should be aware of. As Smeargle has shown us, it doesn't matter how weak a mon may be initially, if it can become broken given a single free turn, then you can make a team that will hand him that free turn on a silver platter. Therefore, you need to argue that Gorebyss isn't broken
even if it is given a free turn. I'm certainly not saying "Gorebyss is broken", I'm saying "we should watch out for Gorebyss, because it actually looks kinda scary on paper". When I feel like it, I'll probably try building a team around her and see what happens. Scoli's starting to prove boring and rather unproductive.
*edit*
Sergeant Spooky As for BPers that can pass 6 or more boosts, most viable boosting sets can pull it off given the right circumstances. Here's a few sample sets:
Gorebyss @ White Herb
Ability: Swift Swim
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Baton Pass
- Iron Defense
- Shell Smash
- Hydro Pump
Takes ~ 2 turns to surpass 6 boosts
Boosts very fast and has good offensive presence to boot.
Bad stats outside of SPA hinder it.
Mew @ Leftovers
Ability: Synchronize
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Baton Pass
- Rock Polish
- Iron Defense
- Taunt
Takes ~ 4 turns to surpass 6 boosts (mfw Mew doesn't learn agility).
Has some pretty good bulk to go with it.
Venomoth @ Black Sludge
Ability: Wonder Skin
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Baton Pass
- Quiver Dance
- Sleep Powder
- Bug Buzz
Takes ~ 3 turns to surpass 6 boosts
Wonder Skin and Sleep Powder both can help buy some time.