Pokemon: Reborn As Ash, I'll Conquer Every League

Reborn as Ash after an unexpected death, He refuses to walk the same disappointing path. No more childish mistakes. No more letting rare Pokémon slip away. No more losing at the final stage. Armed with future knowledge and sharp battle instincts, he begins rewriting destiny from the very first day in Pallet Town. Gym Leaders are stepping stones. Rivals are practice targets. Champions are obstacles meant to be defeated. This time, Ash doesn’t chase the dream of becoming a Pokémon Master. He takes it. — Description from novelcodex.org