"Tests show that its cells closely resemble water molecules, which perhaps explains its ability to conceal its form while submerged. I believe the origins of mermaid folklore lie with this Pokémon."
Restores HP if hit by a Water-type move, instead of taking damage.
Eevee
Jolteon
Flareon
Espeon
Umbreon
Leafeon
Glaceon
Sylveon