There are two books at the 4th Grade reading level.
*A plus is that currently both are available for amazon's buy 3-get 1 free program.
EXPLORE WITH ASH AND DAWN
by Michael Teitelbaum
Tour
key regions with Ash and Dawn. Fans will learn about important sites
(e.g. Pokémon Centers, Poké Marts, etc.) and meet friends and foes.
Reading Information:
Word Count: 3231
Page Count: 48
Accelerated Reading level: 4.7 / points: 0.5
AR quiz: 151455
--sample pages available
Become a Pokémon Trainer
by Michael Teitelbaum
This book discusses the role of a Pokémon trainer, covering equipment, gym leaders, leagues, contests, and battles.
And, according to a GoodReads.com reviewer, it really contains a great deal of advanced information about how to become the best trainer on a Nintendo DS.
Word Count: 2803
Page Count: 48
Accelerated Reading level: 4.8 / points: 0.5
AR quiz: 151453