Violet is a sister of Misty, the second oldest of the four sisters. Together with Lily and Daisy, she was one of the Gym Leaders in Cerulean City for the Indigo Pokémon League. Although being as crazy and pretty as her sisters Lily and Daisy, she is the only one that remains, at times, down to earth and thinks clearly. She does not usually mess with Misty, while Daisy and Lily, in particular, do. You could say that after Misty, Violet is the most mature of the 4 sisters. She and Daisy and Lily form a trio, always doing things for people to see some way or another with stardom and fame. They always excluded Misty, but this does not mean they don't love her.
It apparently belongs to all four sisters. Participates in some water shows with the four. Evolves into Dewgong during a battle against Team Rocket.
The Sensational Sisters's multiple Goldeen inhabit the pool in the Cerulean Gym along with many other Water Pokémon. They first appeared in a water performance called "Underwater Ballet" swimming with the other Pokémon alongside Misty playing the mermaid, then pretend to go to sleep. When Team Rocket take over the show they get the Goldeen trapped in a net. In the end with the help of Ash and his friends including Seaking and Dewgong they are able to get the Goldeen free. It is later seen in the finale of the performance. Three make a brief cameo in Cerulean Blues in the aquarium.