He evolves at any level with MAX happiness(you can check your poketech app, the one with hearts over your pokemon. 2 hearts=max happiness.). But, you must level him up with max happiness during the DAYTIME.
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Riolu evolves when Level Up by Happiness Value at 220 During the Day
Riolu evolves into Lucario at level 14. (But if evolution is skipped, it will try to evolve at every level up after that as well.)
Riolu doesn't evolve by level, instead it evolves when its friend ship is maxed out at daytime and leveled up.
give riolu a soothe bell, then givve it tons of vitamins until it wont eat any more, run around for a very long time, and level it up as much as you can. eventually riolu will have maximum happiness
Riolu will only evolve when leveled-up at a high friendship level in the morning.