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
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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.
Riolu evolves at max Happiness during the day.
It evovles with max happiness
max happiness at 25. it will evolve. good luck.
just max the happiness hope this helps