This idea came from a trailer that showed Popplio using the move 'Disarming Voice', which is a Fairy-type move. Then I thought how interesting it would be if Popplio evolved into a Water/Fairy-type. So I deciced to create a fake evolution based on the Selkie.
The Selkie is a seal that comes ashore and removes its seal skin to reveal a beautiful woman underneath.
It starts off as a seal, and as it evolves, it becomes more human-like, and then ending the evolution witha sexy woman. How amusing would it be if went from "Popplio is a mess" to "Popplio is hot/sexy".