"Goldeen is a very beautiful Pokèmon with fins that billow elegantly in water. However, don't let your guard down around this Pokèmon - it could ram you powerfully with its horn."
Goldeen is one of those Pokemon where territory absolutely matters to it. It's a Pokemon that truly can't work on land, it has to be in the water to fight. Certain titles make fun of this fact, like Super Smash Bros. where Goldeen does nothing but flop around on the stage.
Goldeen's Basic Attacks are Peck and Mud Shot, and its Special Attacks are Horn Attack, Water Pulse and Aqua Tail