I love heracross, my favourite pokemon along with Suicune. I don't know why this wouldn't work but I'm no expert so correct me if this is really wrong.
Heracross @salac berry
Stone edge/swords dance
Megahorn is just about essential. Stone edge for AA or SD for powering up reversal and then Endure+reversal combo. Sure Heracross isn't the fastest out there but a baton-passer with agility or a lot of speed EVs paired with the Salac berry would make it pretty unstoppable in theory.
Just my opinion though.