I always go special Lucario (Special + Speed)
I tend to run something like:
-Wise glasses/expert belt
-Aura Sphere
-Dark pulse (Sometimes dragon pulse)
-Psychic
-Calm mind
Psychic is great for taking down fighting types, dark pulse for ghosts and psychics (is psychic supereffective vs lucario?.. maybe not) Dragon pulse for dragons. obviously, they're tough. Aura sphere just for the STAB and nevermiss. Calm mind is a generally good move imo.
That's just me.
Technically, this is lacking because it has no ground counter, fire counter or steel moves.
This is just what I like, it also tends to throw people off, they don't generally expect a dark pulse, psychic Lucario.
And those are awesome moves.
So yeah.