Riolu does not evolve at a specific level, its evolution is related to happiness. While levelling up does increase happiness, in theory a Riolu can evolve at Lv2 if happiness is increased by other methods.
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lvl 48
Lucario learns bone rush at lvl 19 evolve riolu at lvl 18 to evolve riolu it has to have max friendship if u lvl riolu passed 19 and u want bone rush go to a move tutor
you level it up to lvl 64
It evolves into Octillery at lvl. 25.
reshiram does not evolve