Should still be running something like SD+CC+Espeed+Gear Grind/Ice Punch as a cleaner, right? I can't think of a reason to use its special set over Keldeo's.discussion: where to put lucario?
Drop it in C rank, I guess. It sits in C+ in OU, and compared to there, we have defensive Gyarados, direct competition with Mega Lopunny (and to a lesser extent, other Normal-types, which get STAB Espeed and cool abilities), and the omnipresent Sylveon, which takes huge chunks out of it with fakespeed, or just KOs if Luke has a Defense drop. I could maybe see it used as a secondary extreme killer alongside Mega Lop, but never as a standalone when there are plenty of good mons that do its essential role. So, C.