I think you might be confused with the movie.
True, it appeared in Lucario and the Mystery of Mew witch happened in the Hoenn region, But Nintendo and Pokemon still count it as a Sinnoh Pokemon.
(this includes Lucario)
And as far as I know the only way(s) to get Riolu is:
DPP: Iron Island - an egg gift from Riley
HGSS: Safari Zone -Meadow Area (28 forest objects, 42 rock objects)
BW: Challengers Cave B1 (%5) and B2 (%10)
Riolu is a Fighting type pokemon.
riolu is a fighting type. but when it evloves into lucario its fighting and steel
A Riolu, which can evolve into a Lucario.
Riolu will envolve when riolu's level has reached to the required level. to level him up battle people or battle wild Pokemon
riolu
You can possibly get riolu in Pokemon black
Riolu is a Fighting type pokemon.
Ash does not get riolu but it does follow him in Pokemon ranger and the kidnaped riolu and Ash wants to bring him back so he does alitle bit.....
You can get riolu by releasing 5 lucario's at the release point you will get a riolu ticket use it at the recruit point to get riolu.
Riolu is 4 generation Pokemon. You can get egg only in Pokemon Diamond and Pearl
The Pokemon before riolu is Unown.
Catch a Riolu and evolve Riolu.
riolu evolves when he is really happy
no but you get the riolu egg in iron island
No, friendship will not be affected.
Riolu
How does riolu learn aura sphere in pokemon diamond version?