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sorry, you can't get riolu in Pokemon emerald version.
In the grass area
riolu
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
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.