Go West, Young Ash (Pokémon Chapter Books, #17)

Totodile, Donphan and Heracross-oh my! Ash Ketchum's quest to be the very best Pokemon trainer in the world takes him and his Pikachu through the deep dark forest to the wild west. Ash is determined to earn eight more badges and join the Joto League. Along the way, he battles Team Rocket and thwarts their evil plans to steal some never-before-seen Pokemon.