Goldeen

Goldeen is one of types of Pokémon species who was first introduced in the Generation I series of games which consisted of Pokémon Red and Blue and the remake Pokémon Yellow. You can catch this fish Pokémon in most of the water areas with a good or super rod. However, you canot catch it with an old rod, which can only catch the virtualy useless (unless evolved) Magikarp. Goldeen has appeared in every single Pokémon adventure game to date. They will evolve into Seaking once they reach level 33.

The name Goldeen is a portmanteau of the word goldfish and queen.

When they are ready to lay their eggs, many of them can be seen swimming up rivers in large and expansive groups. They are very strong swimmers that can swim nonstop, even up stream at 5 knots. The large horn on it's head is very dangerous, and could even kill a person. If you put a Goldeen in an aquarium, it has the ability to crash through the glass that it's contained in, no matter how thick the glass is. According to the video games, the unique fish has earned the nickname "The Water Queen", which fits the Pokémon well considering their name.

Anime
In the anime, Misty, one of the show's most notable characters, caught a Goldeen in episode 2. However, the trainer does not use it much, seeing that it can only be useful in the water.