Pokémon, But I'm Forced to Be a Ghost Champion

In the Pokémon world, there is a boy named Xingye in Weibai Town. He was originally a college student on a blue planet. He accidentally traveled to the Pokémon world and had the blessing of the system. He thought he could make a name for himself and easily become the strongest in the world. However, he found that the system forced him to only capture ghost-type Pokémon...