Download or read book The Lost Riolu written by Helena Mayer and published by Scholastic Inc.. This book was released on 2010 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: More action from the exciting Sinnoh Region! Join Ash and his buddies as they complete their epic journey. In this adventure, Ash must help Pokémon Ranger save Riolu from Hunter J, a nefarious Pokémon poacher.