Squirtle

Squirtle has an expansive physical movepool and several neat tricks it can utilize. Its combination of decent bulk with a unique Speed gives it a few niches that only it can fill. Whereas Staryu focuses on Special Attack coverage and can spin as well, Squirtle can revenge kill and provide some different coverage. That being said, Squirtle's Speed is still middling and without investment it can only take so many attacks. Aqua Jet isn't really powerful enough to answer Ghost-types on its own, so Spinning can be troublesome. Squirtle is thus difficult to play to its full potential, but can be rewarding when played properly.