If there is then I would like to know. I would have a good stradagy with it.
Power-swap swaps the stat changes to Attack and S.Attack. But there is a new move in B/W that is pretty close to what you describe. Power-split! this move averages out the Attack and Special Attack of the user with the opponent. While it is not exactly what you asked for it is the closest thing. This is a great move for Shuckle with his abysmal Attack and Special Attack he cripples any attacker with this move easily. I hope I helped :)
If you mean the Attack stat / Special Attack stat, you're in luck. There is:
It's called Power Swap, and the only Pokemon that I KNOW OF that can learn it is Mewtwo, but for a full list: