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.
no but you get the riolu egg in iron island
happiny and riolu
riolu
A Riolu, which can evolve into a Lucario.
You do not find an egg that doesn't hatch into happiny or riolu. You must find a girl and boy Pokemon (or girl and ditto or boy and ditto Pokemon) and put them in the daycare, and they may make an egg and allow you to get an egg that isn't happiny or riolu (unless that was the pair you made the Pokemon for).
If it is a starter
riolu
No, but Lucario can.
no
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.
A Riolu egg can be obtained from Reiley within the Iron Island
At the end of the cave on Iron Island, Riley gives you a Riolu egg.