Marina (EP091)
Marina is a one-time character in the Pokémon anime who appeared in Bye Bye Psyduck.
Marina lives in the Orange Islands. She, like Misty, is a Water Pokémon trainer, and the two of them became fast friends. When they met, Misty's Psyduck had a bright pink tail. Marina said that meant the Pokémon was going to evolve soon, which excited Misty.
Also like Misty, Marina owned a Psyduck. However, this Psyduck was much more powerful than Misty's, as it did not need a headache to unleash its Psychic powers.
During the battle between the trainers, Misty decided to use Psyduck, hoping it would evolve. Ash accidentally tossed her backpack into the water, and when she pulled it out, a Golduck came out.
Thinking her Psyduck had evolved, Misty battled with Marina and ended up winning. It was at this point Misty realized that her Psyduck did not evolve. The Golduck she was using was just trying to impress her. Marina then realized the information she told Misty about Psyduck evolving wasn't true.