Pokemon Arrives, and a Champion-Ranked Trainer Transmigrates

The protagonist, Qin Lingyu, is an Earthling reborn into the Pokemon world and a Champion-level Trainer from Paldea. After the twin deities of time and space brought Pokemon to a world much like Earth by fighting each other on a regular basis, Arceus recruited him to work for it. The story unfolds along multiple plotlines, while the various nations scheme against one another from the very beginning. But that's no problem: the protagonist starts out at Champion level. How could he lose?