This Is the Pokémon World, Right?

This is an ordinary Pokémon world, at least that's what Wu Yu has always thought in the seventeen years since he traveled back in time. However, everything seemed to have changed from the day he became a trainer. "What do you mean my little flame monkey's characteristics have mutated?!" "What do you mean my Eevee can change into eighteen attributes, and can change back when riding on a horse?!" "Why does my biting land shark dance like a dragon? Is this legal?!" "Hiss! What the hell is a monster? What is a pollution invasion? Is this still the Pokémon world?" … Many years later, standing on the ruins of another world, Wu Yu couldn't help but fall into deep thought while looking at the monsters filling the streets. "I remember that I traveled to a Pokémon world at the beginning, right?" (Note: This article will contain a certain amount of original Pokémon forms)