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from a purely evolutionary point of view, we can assume whatever human ancestors were, they might have had decent normal/psychic type attacks, and lost them when they became civilized.
In any case, different types of pokemon are usually pretty chill with eachother in the wild, in a way animals aren't. It's very likely that early human tribes would soon find themeselves surrounded by friendly pokemon eating their scraps, just as real world Homo Sapiens acquired pet wolves.
