Well, this is how you find Riolu, the pre-evolution to Lucario in D/P. I had already walked around with Riley, which is why he's at the end of that cave. I hope this helps anyone who's been trying to figure out how to find Riolu/Lucario =]
~*You have to be able to go to Canalave City, from there you go to the boat that takes you to Iron Island. You walk around inside the cave until you find Riley, who wants to walk around with you inside the cave. Once you have beaten the two Team Galactic Grunts, he gives you an egg that has a Riolu in it*~
And sorry that it's a little shaky, I've found that it's a little hard to manipulate a DS with only one hand XD and yes, those are the dogs barking in the background at the end...just glad they did it when I was almost done *-*
