Absolutely nothing is broken about baton pass. Nothing. It's stopped by SD Pinsir/Talonflame/SD+Sacred Sword/Prankster taunt/Haze/Perish Song/Red Card/Ditto/Prankster Encore. If you can't be bothered to run ANY of those things that isn't BPs fault, it's yours. This is obviously one of those "I don't use it so I want it banned in order to have one less threat" mentalities. Facing Baton Pass=free win.
SD Pinsir. Baton pass teams can use Zapdos totake care of Priority Flying. There are others like Mega Mawile.
SD + Sacred Sword: The SD + King Shield Aegislash set has a lot of problems (a heavy 4MSS to start) that is little seen in the higher leader.
Prankster traunt is mainly seen on Thundurus, who may not have a slot for it, and Sbaleye and Whismicott which have little viability.
What team uses Haze since early Gen IV?
Perish Song was only used in Politoed and Celebi in Gen V: Two pokemon with ower usage this gen. Also, blocked by Mr Mime.
If Red Card has to be used in something else that a dedicated hazard setter, there's a big problem.
Ditto can use Imposter against Substitutes,a nd those are very common. Also, the standard set has Scarf and may not have offensive move or have the appropiate resist.
Prankster Encore is only used on Whismicott as far as I remember.
If foir defeat your strategy you need obscure counters that works bad everywhere else the strategy is uncompetitive.
I give an example of a broken strategy: Mega Gengar alone causes Chansey to be unvuable in Ubers. If MGengar didn't exist, Chansey could be one of the best non-native Ubers in the tier. They have o use the "in Ou inferior" Blissey, AND has to use an item named Shed Shell to be viable, really missing Leftovers.
Right now I dodn't even surprised if Gengarite went the Moody treatment.
An o course, my idea is to ban Scolipede with Baton Pass It's a complex ban but I think this is a special case because Scolipede is an average pokemon outside Bp teams (it's not S or A+ rank, for example). Scolpede has another sets that don't use Baton Pass and they aren't broken.
Actually, Speed Boost is a ability that has abig effect on almost any pokemon and causes a lot of problems in the metagames. The ability doesnt have problems on Ninjask because it's already very fast and it's very frail. It's not uncompetitive on Yanmega because it has no suport movepool, and has the bad Bug/Flying typing. Same with Sharpedo which is very frail. But it brokes the pokemon by his own (Blaziken) or by support of the team (Scolipede).
Banning Speed Boost would be a bad idea because destroy Sharpedo viability in OU/UU and a big part of Yanmega viability in UU.