I'm curious about something, having never actually used Heracross in the 5th Gen.
Why is the SD unviable, while the BU set is viable? The SD set is supposed to be too slow to get a good sweep off, leaving it very prone to revenge killers. On top of that, it has a severe issue with residual damage, given that you want to activate Guts, but must gets status'ed to do so.
However, the BU set suffers these problems as well. Because you boost more slowly, and you have less Attack to start with, you require several more boosts to get the same amount of power. However, this leaves you open to more attacks, making BU Heracross very reliant on its bulk. However, with no defensive EVs whatsoever, and no recovery outside of Leftovers, Heracross' bulk probably won't stretch as far as one might think.
Like I said, I haven't used Heracross this Gen, so I might figure this out by doing so. But, as it is, I'm curious why BU is viable and SD isn't.