I could go on all day with Lucario....but I won't. Here's some suggestions:
Lucario @ Muscle Band/Life Orb
Adamant
Inner Focus
- Close Combat
- Blaze Kick
- Earthquake
- ExtremeSpeed
Physical Sweeping Lucario. Close Combat for STAB, Blaze Kick for Skarmory, Earthquake because pretty much every physical sweeper who can learn it should have it, and ExtremeSpeed to catch out people who are faster than you. 80 Power is pretty evil on a first-strike move.
Or...
Lucario @ Wise Glasses/Life Orb
Modest
Inner Focus
- Aura Sphere
- Psychic
- Dark Pulse
- Water Pulse
Special Sweeping Lucario. Aura Sphere for a never-missing STAB attack, Psychic for Fighting-types, Dark Pulse for Ghost-types who will resist Aura Sphere, and Water Pulse for Fire-types. The confusion effect from Water Pulse makes up for its otherwise mediocre damage.
Credit goes to Carmen Lopez for this set, since she was the one who came up with it for me for my own Lucario.
This one, I'm not so sure about, but see what you think:
Lucario @ Salac Berry
Adamant
Inner Focus
- Reversal
- Crunch
- Endure
- Swords Dance
This one's a bit more complicated. Basically, use Swords Dance until you know your opponent's next attack will kill you, then use Endure the turn you would otherwise be killed. This will (hopefully) leave you with 1 HP, at least one Swords Dance Attack boost and a Salac Berry Speed boost. Now, start battering your opponents with your now 200 Power STAB'ed Reversal, which will OHKO almost anyone with just one Swords Dance - imagine what would happen if you pulled off two or more! Crunch, again, is for the Ghost-types, since they cannot be damaged by Reversal.
In closing, Lucario is awesome.