World of Sinnoh /
by Simcha Whitehill.
- New York ; Toronto : Scholastic, c2008.
- 96 p. : col. ill. ; 23 cm.
- Pokémon diamond and pearl .
Includes a fold-out map.
Ash's journey has brought him to a new region where he battles for ribbons and badges and gets the lowdown on the Trainers willing to steal Pokémon or beat him in battle.