History
Golduck first made his appearance in A tale of ninetales after an accident caused Red and Blue to switch their Parties. During his stay on Red's team he, along with the rest of Blue's team experienced Red's different style of Pokémon training and after both trainers returned each others Pokémon he seemed to have become friendlier to Blue (while Red's team had become angrier).
Golduck later appeared during the battle against Team Rocket where it used its psychic powers to find the Pokémon responisble for putting up a barrier around Saffron City which prevented any access to the city and with Pika's help they managed to defeat it.