What if I'm someone else and I think using a crobat is stupid so I'm using a gliscor.The real problem however, is everyone know you're crazy to stay in on a heracross, so most will just Stone Edge you so it can take down it's counter so that it could sweep.
Staying in would result in you taking neutral hits and a beat-down from your horrible conditions, OR, that nice little crobat would get some rocks to the face, resulting in a dead crobat, a burnt or (even better) sleeping Cresselia so it can just ram it's little horns in your face.
taking nuetral damage with relfect up, stone edge will only do 35% which is only 29% after leftovers and I can just ohko with aerial ace.