T4R
Seriously. If you watch the beginning of the anime, it seems as if the understanding of Pokemon is very limited. It ever appears as if they are some what new. Yet, the technology is more advanced than today's standards.
did something happen? Perhaps there was a nuclear war that caused pokemon to mutate.
Maybe Pokemon recently arrived from another planet.
Either way, I get the vibe that they weren't always there.
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Adventure Time is set in a post apocalyptic world, so why not Pokemon?