In that large, mazish area before the barrier room, there are two rooms on the left and right walls. The two Riolu are in those rooms. You have to navigate through the icy maze thing to get to them.
riolu is only obtainable through a special misson
To get through that blue energy wall in Pokemon Ranger Shadows of Almia in the Almia castle, capture Froslass as a boss, have 2 Riolu's in the party and use it's power.
Almia Castle
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.....
lucario-lucario and the mystery of mew,and The Lost Gym Leader Strategy. riolu-Pokemon Ranger and the kidnapped Riolu
The Riolu in question will be Level 30.
hi
go into almia castile and search around
you can you just need ranger net with a wireless internet connection
Riolu first has to evolve into Lucario in order to learn Aura Sphere. However, if you own Pokemon Ranger: Shadows of Almia you can download a special mission called Rescue the Kidnapped Riolu through wifi. After you complete the mission you are able to transfer a special Riolu that knows Aura Sphere to Pokemon Diamond, Pearl, or Platinum versions.
You get riolu when you go to Almia Castle to search for the blue gem.
Riolu evolve's normally and pichu evolves through happie'ness