"Horsea eats small insects and moss off of rocks. If the ocean current turns fast, this Pokémon anchors itself by wrapping its tail around rocks or coral to prevent being washed away."
Horsea is an example of how cute Pokemon can look, and as such it's popular for a lot of people. It's biggest claim-to-fame though was that it was one of Misty's Pokemon in the anime, and actually helped warn her, Ash, and an entire city about an upcoming attack by Tentacruel.
Horsea's Basic Attacks are Water Gun and Bubble, while its Special Attacks are Bubble Beam and Flash Cannon.