Wartortle

Squirtle's evolved form, Wartortle, is another middle child with only a few devotees, but more thought went into it than you may have initially guessed. The pokedex keeps talking about how its big, furry tail is a "symbol of longevity," and this actually has a sort of folkloric basis: Minogame are turtles said to acquire flowing, hairy tails of seaweed as they reach hundreds or even thousands of years in age, and multiple depictions of them even have those dog-like ears sported by Wartortle. In reality, of course, a "tail" like this just forms on some turtles from algae buildup, though Wartortle's pokedex makes mention of that, too; that the eldest Wartortle have algae on their shells. Neat!