Pokémon Sword and Shield: Road to the Unbeatable Champion
UmbraNightshade647
Leon, the unbeatable champion of Galar, wishes to bring out the potential in trainers so that they can reach him in the champions league. Given a Scorbunny to help Leon accomplish his goal, James sets out to face Leon in the championship to put an end to his winning streak.
Note: Several characters from the Sword and Shield games have been aged up to at least 17-18 years old since I'm not particularly comfortable writing some potential themes amongst 10 year olds.