Question

How do I get Riolu egg in Pokémon Go?

Answer 1

Riolu is also unique in that it is the only Pokémon available in all three egg pools – PokéStop/Gym eggs, Gift eggs, and Adventure Sync 50-km reward eggs

For a more thorough guide on how to obtain and hatch one, check my source.

Hope I helped!

Answer 2

Rilou hatches from 10km eggs, but there's a very high chance of hatching a Feebas. You won't be guaranteed. Hope you're lucky!

Comments

I don’t think Feebas is in 10ks anymore. The annoying one now is Klink, and to a lesser extent, Shinx.