First go to iron island. Then go to the third floor and you will see Riley. She travels with her lucario. You will have to fight a few people. However it is the last floor. You will fight Team Galactic. Then when you defeat them you are close to the exit. First of all you have to have one free space in your party. Then when you reach the end she will give you a riolu egg. If you want another riolu good luck on getting the national dex cause you gotta get a ditto to mate. Even though it's a boy you can still mate. My jolteon is in there with my ditto and it's a boy. To get a ditto is to use the pokerader at canalave. Go to the one closest to you. Don't automatically run to the shiny grass. That's were most ditto's are.
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Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
riolu evolves when he is really happy
No, friendship will not be affected.
riolu
sorry, you can't get riolu in Pokemon emerald version.