Riolu is considered a 'baby' Pokemon like Smoochum, and Pichu. It cannot breed until it evolves.
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If you want riolu to evolve, make him happy
Riolu weigh 44.5 lbs.
riolu evolves when he is really happy
Riolu evolves at max Happiness during the day.
No. Rioru is merely a typo or a trick. Riolu's Japanese name is actually Riolu like every other language.