It wasn't very useful unfortunately, I mean you could use it to avoid damage, sink, and negate poison, though there aren't many moments where those gimmicks are actually being used, altogether it was kinda unneeded.
I thought it was cool in the one with the underwater tornado thing. (how could I possibly forget the name of that one, I've played it TONS of times ) It was used well there. Other than that, didn't see much use in it, similar to Cubone.