most people say 100 happiness so if you want to evolve it from an egg it should have about 70 happiness so give it proteins irons etc. and give it a soothe bell and battle.
p.s. don't let it lose
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riolu doesnt evolve with lv im afraid. like eevee needs maximum happiness in the day to evolve into espeon you need to lv up at maximum happiness in the day to evelve riolu into lucario. i know its anoying when that happens!
Riolu evolves when Level Up by Happiness Value at 220 During the Day
it will need about 100 happiness
Its happiness value need to be at 220 in the Day Time.
riolu dosent need a stone just raise it intell its lv46 that's what level mine evolved at.