sorry, you can't get riolu in Pokemon emerald version.
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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
No,You can't.There is even no Riolu in Emerald and even to all 3 first Generations (Yes,including the Emerald.)Riolu and Lucario only appears at Generation 4 and above Pokemon games.
He is a generation 4 pokemon, and therefore not obtainable in emerald
I'm sorry, but you will have to trade from Pokemon LeafGreen or FireRed. There is no way to find a Poliwag in the wild in Emerald.
You can find them underwater or held by some wild Luvdisc.