why wont my riolu evolve
why wont my riolu evolve
Riolu is a Happiness based evolution, when it is happy enough it will evolve when it gains a level.
Just check out this guide, including the comments to learn some great tricks to get your Riolu to evolve:
Pokemon Platinum Happiness Guide
Finally, a new generation of Pokemon for us to enjoy. There is much to look forward to in 2011!