You must raise Riolu's happiness to the maximum then level it in order for it to evolve into Lucario.
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Riolu evolves into lucario and lucario doesn't evolve.
evolve a riolu from challenge cave your welcome :)the dude
you get a riolu which can evolve into lucario
from Riley he gives you a Riolu egg and you can evolve it at high friendship
Lucario because it is the after evolution. Riolu is really strong when you raise it without evolving it, but check it's moves, and you WILL want to evolve this pokemon at some point.