Ok, so I have caught the pink sea slug-like Pokemon. Number 60 I believe. It's female. I'm on Route 213, and have just encountered a blue sea slug-like Pokemon. At first I thought it was the evolution, but after the encounter it did not appear in the Pokedex. I then assumed it was the male version. In terms of there being gender differences. But just now, I encounted a FEMALE version of the blue sea slug-like Pokemon. WTF? Can someone explain this Pokemon to me? What's with the different versions?