you can't find riolu, but u can get him. Go to iron island and youll find this dude (i think his name was cheren) that has a lucario and stays with you until you get to the end of the cave. make sure to bring 5 or less Pokemon because he will give you an egg that, when it hatches it is a riolu. hope i helped
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go to iron island and find riley. go battle the team galaactic guys and after he will give you a riolu egg then just hatch it to get riolu
to get a Riolu egg in Pokemon platinum you have to go to iron island by taking the ferry from Canvalve city then find riley in the cave and battle with her. then at the end she will give you the egg but you must have room in your party.
u cant but if you go to riley in iron island and complete the quest he will give you an egg that hatches into riolu
you get a riolu which can evolve into lucario
Riley will give you and egg on Iron Island