It evolves when it is happy during the daytime.
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answer riolu doesnt evolve by level it evolves by care and love
Riolu evolves when you have maxed out its friendship, it will evolve at the next levelup during daytime.
You must raise Riolu's happiness to the maximum then level it in order for it to evolve into Lucario.
with high friendship
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.