you can breed a lucario with a ditto or go to iron island and get a egg from riley
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No. Riolu is classified as "No Egg Group." However, you can evolve it and breed it with Field or Human-Like pokemon.
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)
Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
Egg move, so you must breed a Female Lucario with a male Pokemon that knows Crunch (Keep in mind that Riolu cannot breed because it's a Baby Pokemon).
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.