Depends on its nature
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Berries that increase EVs, such as the Tomato Berry, will help it be happier and evolve sooner.
Riolu's friendship must be at least 220 as it's max happiness base stat is 225 and you must level riolu up during the day. The possible ways to do this are:Give riolu a soothe bell.Keep riolu in the lead of your party and fight battles with it without having it faint for it decreases happiness.Making riolu learn TM moves which I would advise to refrain from doing.Giving riolu a massage in the Ribbon SyndicateLastly, feeding riolu certain berries
No. Rioru is merely a typo or a trick. Riolu's Japanese name is actually Riolu like every other language.
No. Riolu is classified as "No Egg Group." However, you can evolve it and breed it with Field or Human-Like pokemon.
Riolu is considered a 'baby' Pokemon like Smoochum, and Pichu. It cannot breed until it evolves.