Su Yang traveled through time and got two pieces of news, one good and one bad.
The good news: This is a world where individuals and Pokémon coexist.
Bad news: Pokémon are still considered monsters.
Forget it, since this world is ignorant, I will lead him to civilization.
From slave implements to Poke Balls.
From the Pan-European League to the Pokémon League.
From primitive slash-and-burn farming to Pokémon-assisted efficient farming.
In the end, Su Yang led the entire world into a developed society, and was respected by the alliance as the mentor, leader, and founder of Pokémon civilization.