There are so many bad arguments in this thread, it's ridiculous. If you can't elevate your ranking above ~1750 ELO, I sincerely doubt you have anywhere near enough experience with BP to make an educated statement about it. If you think it's rare, then you're definitely not playing at that level. BP is common and indeed a legitimate threat.
First of all, your continuous rudeness and condescension toward several users are misplaced and unnecessary, so perhaps it is you who should refrain from posting in such a manner.
You said here that Prankster Taunt is the only hard counter after I brought up Haze. Espeon can block Taunt, but Haze is foolproof against Baton Pass. I mentioned Prankster Murkrow as only an example user of it but I recommend Unaware Quagsire more than anything.
The fact that Haze is uncommon or "niche" does not disprove that carrying this one move screws full Baton Pass completely, and it's distribution is low, which I am not denying, but the fact that there are users of this move with Unaware and Prankster gives it the exact edge it needs to overcome this entire strategy and screw the whole team with almost no effort, thereby ridding your whole team of the issue. This is by far the best answer and deserves consideration.
If players acknowledge this and make the conscious decision to not include it in their team, they can only blame themselves when they run into full Baton Pass. If players choose to not cover this threat, they have little right to complain about it and should probably take a step back and actually consider the relevant threats of the current metagame when teambuilding, because this strategy is very easily stopped and is only annoying to people who refuse to prepare for it.
Bri, I respect your opinion but this really doesn't make any sense. List of Haze users viable in OU: Quagsire, Politoed. List of Prankster Taunt users viable in OU: Thundurus, Sableye. Are you suggesting that every player needs one of these four Pokemon on their team to actually beat this strategy, and that is okay? It's not like Haze is even a full counter.
You can still lose running Haze. BP has Smeargle to Spore the Haze user, Mr. Mime to Encore the Haze and just get the team all set up again, and Espeon's Stored Power still does crap loads. Espeon needs 10 boosts to guarantee an OHKO on Quagsire with Stored Power given 0 SpA EVs, and 9 with 40. This isn't very hard to accumulate, and Haze can just PP stalled if you spam it due to the fact that stall teams (Quagsire) aren't exactly doing much in return to the BP users. And these Haze users are only viable on two archetypes: stall and the rare rain, respectively. Prankster Taunt has the benefit of Thundurus, which is extremely good on offensive teams, but it has to sacrifice a lot in that one slot (it has like a million options) just to run Taunt, which a lot of teams can't afford. Sableye is extremely niche, and mostly irrelevant in XY OU. So basically you have to run one of these four Pokemon for these counters, and sacrifice a better option in 95% of other matchups just so you don't get totally steamrolled by BP. This isn't adapting, this is overcentralization.
BP is a very formulaic playstyle that requires little actual knowledge of the metagame to play. You have a couple coinflip predictions in a given match,
maybe, and that's it for actually have to think. It's uncompetitive, and it's broken as hell too because of the dearth of ways to handle it. BP can be beat, but only with one of a few select, generally unfavorable options. If that isn't something to get rid of, I don't know what is.
A multiple BP user ban is probably the best way to go about it. Banning cores is dicey, and really unnecessary. A simple 2 Pokemon cap solves the problem well. So you can still have the legitimate uses of BP, but full BP doesn't exist.
Sorta an aside but assuming we actually go through with this, a suspect ladder doesn't really make much sense. People will just run the random obscure stuff to beat BP that makes little sense in a normal environment. BP won't be good on this ladder because every team will run one of these couple things to beat it. Just make a decision and leave it at that.