What level does a Riolu approximately evolve without using any berries Poffins or a Soothe Bell

1. get the friendship checker app from eterna Pokemon center
2. have riolu in your party
3. go to hearthome city
4. hop on your bike and go around the city periodicly checking riolu's happiness with friendship checker app
5. when has two big hearts over his head level up with rare candy during the day

NOTE: does not evolve at any specific level