give him a vitamines like proteins and let it hold an item name soothe bell and only one lvl he will evolve into lucario.
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You must raise Riolu's happiness to the maximum then level it in order for it to evolve into Lucario.
Riolu evolves from happiness. If he's really happy he will evolve. Normally around levels 26-34.
If you want riolu to evolve, make him happy
Riolu evolve by happiness during the day.
It can evolve anytime after it learns the attack "Rollout".