Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
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If you mean Riolu, here's a tip: you can get an egg from Riley when you hit the Iron Island first time. When the egg hatches, you will get Riolu.
riolu
in order to hatch a riolu egg you need to walk about 5,000-6,000 steps
To breed a Riolu, you need to put a Lucario/Riolu with a Pokemon of 1. The opposite gender, and 2. Sharing an Egg Group with Lucario/Riolu into the Daycare Center. (Those Egg Groups being Ground and Human Shape) OR Put a female Riolu / Lucario with a Ditto in the Daycare Center Following either step, an egg will be produced. Walking/Biking with this egg in your party will hatch it into Riolu. (6656 Steps, which can be halved by bringing a Pokemon with either Flame Body or Magma Armor as it's ability)
No. Riolu is classified as "No Egg Group." However, you can evolve it and breed it with Field or Human-Like pokemon.