Depends on the level but Riolu evolves into Lucario when it has high enough freindship and learns beter moves.
That is true but I think Riolu is cooler than Croagunk so.. Riolu is better!!
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Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
pokewalker route
riolu evolves when he is really happy
Lucario because it is the after evolution. Riolu is really strong when you raise it without evolving it, but check it's moves, and you WILL want to evolve this pokemon at some point.
It's a Croagunk.