Ash Ketchum, the very first Alola League Champion and now the World's strongest trainer by the World Coronation Series has begun a new Journey. After separating with Chloe and Goh, he discovers a new island which turns out to have a ton of surprises awaiting for him. Along the way, he reunites with old pals and rivals. Some of them stayed for a while, some left and some permanently stayed with Ash.