Dude, it's gotta be yachechomp. Banning chomp but allowing mence is really biased. So I'm going to throw my support behind yachechomp.
If your still insistent about here are my other candidates
Ddmence/mixmence- the fact that the other exists is what makes both sets so dangerous, so IMO you have to include both
ANY common latias set- nuff said EDIT: apparently she's banned from this poll as well.
Cb scizor- the #1 pokemon in the meta from platinum untill a moth ago deserves a nod.
Steath rocks- just as dangerous, maybe moreso, than any pokemon. An entire class of leads developed that valued the entry hazzard over the pokemon that layed it.
Rotom-A- the #1 pokemon that kept sr up on the field and basically screwed rapid spin in ou (except lo spinmie). I would say a specific set but offensive and defensive rotom sets did the same job in different ways.
If your still insistent about here are my other candidates
Ddmence/mixmence- the fact that the other exists is what makes both sets so dangerous, so IMO you have to include both
ANY common latias set- nuff said EDIT: apparently she's banned from this poll as well.
Cb scizor- the #1 pokemon in the meta from platinum untill a moth ago deserves a nod.
Steath rocks- just as dangerous, maybe moreso, than any pokemon. An entire class of leads developed that valued the entry hazzard over the pokemon that layed it.
Rotom-A- the #1 pokemon that kept sr up on the field and basically screwed rapid spin in ou (except lo spinmie). I would say a specific set but offensive and defensive rotom sets did the same job in different ways.