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There's implications that humans were once Pokemon, but humans took a different route in evolution.
Otherwise you've got general Psychic trainers, and standouts like Sabrina (who even mentioned that all people have Psychic power), Olympia, or Caitlin; or someone like Riley who can utilize aura.
Then there's people like N who can understand Pokemon, and literal superhumans like Koga, Janine, or the *teleports behind you* Shadow Triad.
Giving them a typing, it'd probably Normal/Psychic