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Nessa's gym has statues of two Pokemon (or, likely more accurately, two formes of the same Pokemon) outside of it. I've seen some people speculating about what they may be, but the answer to me seems obvious: They're Sahuagin.
Sahuagin should be pretty familiar to most D&D players. They're shark-worshipping warriors that dwell in ocean waters. They are bipedal creatures with fins very similar to what we see on the statues, and the statues additionall shark-like fins make it obvious to me that these Pokemon were directly inspired by this creature.
I guess it's just speculation, but boy the likeness is pretty striking, don't you think?