If you want to look for riley he will be at the bottom of the left staires.
there is iorn island, full moon island, and new moon island
After the Iron Island side-plot you can meet Riley at the Battleground in the Survival Area.
riley is on the island in canalave
riley is at the iron island if you go with him at the end he will give you a egg
you get it from Riley from iron island ,from Jesse and Ryan Termaat
Well, how should i descibe it? You can meet Riley only on Iron Island. He'll ask you to help him through the Island, trying to find out who is disturbing the Pokemon of Iron Island. After battling two Galactic Grunts (who were disturbing the Pokemon), Riley asks you if you want a Pokemon egg. Inside the egg is Riolu, who evolves into Lucario, but if you don't have room in your party, Riley will wait right there at Iron Island until you take the egg. After you leave Iron Island, Riley will, too. You can only see him in the Battle Tower after that event.
Riley gives it to you at iron island
Iron Island
you go to iron island and talk to someone named riley and you get strength and then you go and train with her.
you get an egg from Riley which hatches then evoles to a Lucio when happy! Riley is in Iron Island in Canavel city :)
You find him on iron island in the cave
You get a Riolu egg after helping Riley at Iron Island