Where do you find Riolu in the Safari Zone SoulSilver?

You can't find Riolu in the Safari Zone in Pokemon SoulSilver. Riolu is not a Pokemon that appears in the Safari Zone in any of the games.

You can, however, obtain Riolu in SoulSilver by:

* Trading: You can trade for a Riolu with another player.

* Breeding: You can breed a Lucario with another Pokemon that can breed to produce Riolu (such as a Ditto).

Please let me know if you have other questions.