Rex is a young kid who was facinated by the world of pokemon and pokemon trainers seeing them working together side by side, one day he and his friend hop saw Leon compete in many pokemon battles and become a champion the two were amaze on how cool Leon was when he defeated the champion and claimed the title they decided to become pokemon trainers and surpass leon One day when rex turned 13 his father who was working overseas in the kanto region, knows how jealous rex is of hop that he got his first pokemon wooloo sent him a present a pokeball containing his partner a charmander with a note saying that his dad got in contact with people who are experts in a phenomenon in galar and that his charmander can gigantimax I've played pokemon shield and the story will mostly follow the ones in the games with some differences(I dont own the pictures or videos used in here)
6 parts