Elf: I am a member of the Weather Team and I beat the Champions League

An accident caused the protagonist to travel from Blue and White Star to the world of Pokemon. He has no background, no system, and no golden fingers. He cannot lead the Yusan family. As a civilian trainer, how can he compete with the direct lineage of the alliance?
In order to stand out in the Pokémon world and prove himself, Taichi Yagami began to build various weather teams one by one.
Rainy day team, when the storm comes, tremble in the rain!
Sandstorm Team, when the big sandstorm comes, feel the power of the wild sand in the sky!
Team Sunny, when the sun comes, feel the heat under the clear sky!
Hail Team, when the hail comes, feel the cold of the winter icicles!
In this way, each weather team was built by the protagonist using the most common elves, and their combat power increased exponentially.
Let’s see how Taichi Yagami, as a commoner, can defeat the Champions League.