Riolu evolves by how happy it is with its trainer, it needs to have maximum happiness in order to evolve into a Lucario.
When you get it's happiness up and level it up during the morning or day
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nu uh my riolu evolved at night and it was level 30 so at night too :] HA
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If you want riolu to evolve, make him happy
Riolu evolve by happiness during the day.
Riolu doesn't evolve at a specific level. It evolves with maximum friendship.
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.