Aquatic Bagon Cocept

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Theory: In prehistoric times, Bagon's line was closely realted to Totodile's, having a mostly aquatic based life. The aquatic ancestor did not evolve into a Flying-type, instead it's line being entirely Dragon/Water types. These Pokemon would have behaved similar to crocodilians of our world, with the ancient Shelgon being mostly sedentary in behavior as it awaits evolution. It's shell would have been lightweight, possibly designed to let it hide amongst rocks as it waits to evolve.