I don't think you can
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the egg you get from riley is a riolu egg riolu will evolve into lucario
the egg that riley gives you is a riolu it is the baby form of lucario hope it helps
There's a guy on Iron Island named Riley. That's not a riolu that's a lucario. Either hatch the egg from riley or go to Snowpoint city South until you almost get to the blizzard on route 217 where a black belt guy who is spinning around if you battle him he will a riolu.
Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
Riolu, number 115 on the Sinnoh Pokedex, can be obtained as an Egg from Riley in Iron Island after helping him get through the cave.