Water
Superbi Squalo always liked water. So it was no surprise to him that he possessed a rain-type flame. Granted that was only AFTER he knew what the hell a flame was.
In spirit of his love of sharks, Squalo had learned to swim like a shark. Or something to that effect. The point here was that Superbi Squalo was an excellent swimmer. It probably helped that he was born with an enormous lung capacity. But, of course, there were some things about Squalo's swimming that could have only resulted from years of consistent practice. Things like his stamina or his ability to dive without making so much as a ripple. The fact that Superbi Squalo excelled at silently moving through waters at high speeds without ever surfacing, or drawing more attention than any other water creature would.
It's a terrible pity he's never been given a mission that requires him to swim.
