I love Riolu so much . This is an awesome drawing! I love how you added a green bandana to this, very nice touch. Considering you could have just done a normal Riolu without anything, this is a really great drawing.
It looks really great with the glowy black outline. This is colored/shaded really well, and the colors are 100% accurate! It's great that you did a pose rather than making him/her just stand there.
The back round fits well with this drawing, I think. If you look close at the back round, you may not see it too, but it looks like there's a person . And, I know the name isn't a big part of this, but how it says "Riolu" in a fancy-ish font looks very good. I love the glow of the name, too!
You put everything in a great position. I love the glow of Riolu the best though . Amazing job with this whole drawing! It's a great deviation .
Overall, this would get 4.5 Stars, I think. This is an amazing drawing!