Summoning the Crown of the Elf

The fourth place in the Trainer League Champion Trainer Ranking - Night Emperor.
Has twelve main Pokémon rated as Nightmare.
However, even with several Legendary Pokémon in hand, they are still so insignificant in the face of the power of the world.
Through the cracks of time and space, when the champion trainer came to earth.
When this world, which also has trainers and Pokémon, welcomes this traverser from another world.
What kind of story will happen?
[Elves come to reality, Pokemon, Pokemon fan fiction]