The Lost Riolu is the second book in the Pokémon Diamond and Pearl Chapter Books.
It is 78 pages in length.
Rescue Mission: Riolu! When Ash and his friends encounter an injured Riolu, they want to help it. But this is no ordinary Riolu. It's afraid to trust Ash, and with good reason: Riolu's on the run from two different groups of Pokémon poachers, including ruthless Hunter J.
Now it's up to Ash to win the little Fighting-type's trust. Because the move that makes Riolu so special just may be the only thing that can save it....
This plot summary is incomplete. Please feel free to edit this plot summary to add missing sections and complete it.