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Easy.
Pokemon are proven to have variable heights and weight; the behavior described in the dex is inconsistent with the general description of pokemon, that being they can have many different personalities, even within species, and that they think and feel similarly to what we do; and the dex is even incorrect about what lives in the region if the postgame is to be believed. Even if not, there are still things it counts as native to the region despite evidence of the contrary, such as the Safari Zone, pokemon you only get from trades, or other situations in which it is clear the pokemon are foreign (Mr. Backlot, BW's transfer machine, and Yungoos/Gumshoos)
