First you have to go to the middle of iro island and battle lots of trainers with him. After you beat those trainers you get a riolu egg which hatches after about 6500 steps.
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Riley does. He can be found in Iron Island, off Canalave City.
iron island, (where you meet riley and he gives you a riolu egg,) Full moon island,(where you first see cresselia,) and New moon island (where you catch darkrai)
riley gives you an egg and it hatches into riolu it evolves into lucario with friendship you find riley on iron ball island.
riolu
you can breed a lucario with a ditto or go to iron island and get a egg from riley