Misty's Psyduck is a Pokémon caught by Misty in Kanto.
Psyduck was the fifth Pokémon she caught. It is still with her in the Cerulean Gym. Psyduck is almost useless, except for its Psychic Attack and when its headache gets severe. Psyduck almost constantly escapes its Poké Ball and is very dopey.
She caught him by accidentally dropping her Poké Ball and Psyduck touching the button. Although it can sometimes annoy Misty, she and Psyduck have a good bond and Misty refused to trade it for any Pokémon no matter what.
It was close to evolving and Misty thought it to have evolved into a Golduck during the journey through Orange Islands, but it was later revealed to be a wild Golduck that liked to impress girls.