Lucario doesn't evolve. What, were you expecting a really wicked Pokemon?
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Riolu evolves into lucario and lucario doesn't evolve.
Lucario DOESNT EVOLVE
it does not evolve
Lucario doesn't evolve according to level because it's not capable of evolving.
You must raise Riolu's happiness to the maximum then level it in order for it to evolve into Lucario.