Amazon offers Classic Chapter Book Collection (Pokémon) (Pokémon Chapter Books) for + free shipping with Prime.

Product Description:

Eight illustrated chapter books based on the classic characters found in Pokemon GO and the classic animated series on Netflix. Now back in print!
Discover the original adventures of Ash and his loyal Pikachu in this classic chapter book collection! These characters can be found in Pokemon GO and the classic animated series on Netflix.
This boxed set includes paperback reissue editions of the following eight Pokémon titles:
THE FOUR-STAR CHALLENGE
JOURNEY TO THE ORANGE ISLANDS
PSYDUCK DUCKS OUT
RACE TO DANGER