Regions play a big part of defining the series, but the games don't always do a perfect job of rendering their settings in a way that makes sense. Earlier titles all featured regions based on areas of Japan, while later entries have taken on a number of other cultural inspirations. Although the prevailing influence of one real-world environment can always be felt in a region, certain elements can feel anatopic in a way that ultimately doesn't make complete sense.
It's not uncommon for Pokémon themselves to seem somewhat out of place in the region where they're first introduced. While many are perfectly at home in their environs — Alola, for example, features plenty of proper tropical island creatures — every game tends to have at least one or two major fish out of water situations. Although the fictionalized nature of the world makes real-life incongruence negligible, it's still hard to justify regional Pokémon that are a complete mismatch for their ecosystem.
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Occasionally, Pokémon can take inspiration from the fossil record instead of currently living creature. The Baxcalibur line is one example of this, which justifies its inclusion in the Paldea region via likely inspiration from dinosaur fossils found in Spain. On the other end of things, Dragapult appears to take influence from the ancient Dipolcaulus, which doesn't appear to have ever lived anywhere near Great Britain. As the Galar region where Dragapult is found is based off of Great Britain, this is a somewhat random inclusion, although far from a particularly notable logical infraction.
The Gen 5 setting of Unova is inspired by New York, making the inclusion of Blitzle a somewhat odd one. Equines like
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