Yeah, I was looking it up because I saw it mentioned in some legends and it totally lead back to actual pokemon information on the gear and everything.

So it's small but you know how fish form schools to protect themselves in other worlds?

This one actually has a form called School Form. It's from it's ability and it just ...becomes a mass of fish pokemon that work together in the shape of a giant fish. Well a giant fish that sort of resembles a submarine monster. There's some pretty neat pictures out there.