Staryu. The core of this Water Pokémon shines in a rainbow of seven colors, a core that is valued by some as a type of jewelry.
– Ash’s Pokedex
Staryu is one of Misty’s signature Pokemon. Despite it not having a face (eyes or mouth), Misty seems to understand what it says/needs. It does make noises, even though it has no visible mouth. Misty used it quite a lot in the anime.
Stat-wise, it’s quite fast (though not as fast as Starmie), and has decent Sp Attack, but quite low HP. One of its abilities is more useful (Natural Cure) than the other (Illuminate).