^^
Well the most powerful being we've ever seen in the DBZ canon was super Vegito. So it'll be pretty damn impressive if this guy can top that kind of power. Therefore, I'd agree in that the only force I could possibly imagine being enough to stop the big bad (if this is the case) would be a SSJ2 or SSJ3 Gogeta. And if all else fails, maybe they could borrow a page from movie 7 and have SSJ3 Gogeta absorb a super spirit bomb?