Misty's Psyduck (anime)

Misty's Psyduck is a pokemon caught by Misty in Kanto. It is still with her in the Cerulean Gym. Psyduck is almost useless, except for his Psychic Attack. Psyduck almost constantly escapes it's pokball during every battle that Misty is in.

She caught it by accidentally dropping her Poke 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 pokemon no matter what.

In one episode it was close to evolving and thought to have evolved into a Golduck, but it was later revealed to be a different pokemon.