Lucario is fairly anti psychic as it is..
As it stands, lets talk about the "standard Lucario"
Adamant@ Focus Sash
Shadow Claw/Crunch/Stone Edge
If you seriously are wanting an anti psychic, go with crunch. However, Extreme Speed, well, should take care of ANY psychic you come in contact with, baring cressila. Stone edge covers a whole lot better...
Personaly, I like to run with Extreme speed AND Bullet Punch..
After a dance, Bullet Punch cleans up gengars and other fast dudes, gaining the stab, and then let close combat do the major cleaning.