Lucario is one of my best special sweepers. other good sweepers are dragonite(physical),& Accelgore(special). The Key to haveing an effective sweeper is speed and a ridiculous amount of power in either atk or spatk, sometimes both in the case of dragonite which has ridculous atk and whose spatk is only a few points lower. as for hold items life orb is best for sweepers since they tend to run a combonation of moves set up to take out as many opponits as possible esspicially those who have a type advatage over them. hope this helped.
Strive for an epic battle for all to see!