We had that as a goal with Syclant.
We realized there might be legal issues/Game Freak might not be willing to accept a fanwork precedent. Additionally, I think we would lose the rights to Tomohawk and Scratchet. Game Freak might even nerf the shit out of them if they accepted, although that isn't necessarily likely.
On the other hand, Tomohawk does look pretty awesome, and I wouldn't mind sending it as inspiration for an official Pokemon.
if I were gamefreak I wouldn't nerf it at all; maybe buff it a little or give Scratchet an alternate physical evo that keeps Scrappy. Unresisted STAB with Scrappy + Potential Tiger Pokemon who can use it = awesome. But that's just me x)