Question for you people: Would you make Lucario a special sweeper or a physical sweeper? His attack/sp. attack are pretty similar, I kinda prefer the special attacks (Aura Sphere - Fight, Flash Cannon -Steel, Psychic, Dark Pulse) over what I'd make his physical attack set be (Close Combat - Fight, Earthquake - Ground, Poison Jab - Poison, Shadow Claw - Ghost) due to having a steel type attack, though the physical set has a bit more coverage of types. Also would you recommend a +Speed nature or a +Att/Sp.Att nature? His speed is already pretty high (90 on Lucario and 112 on Mega Lucario). Also note that Mega Lucario has an ability that increases the STAB to 2x instead of 1.5x, so having a steel type move is kinda nice when a fighting move wouldn't be as effective (though they share a lot of type strengths so it might be a moot point).
I assume EVs would be max Speed/Att (or Sp.Att). Thanks for your input.