Golduck is a blue, bipedal, duck, or platypus-like Pokémon. It has red eyes, a cream-colored beak, a red gem in the center of its forehead, and four spikes on the back of its head. Its hands and feet all have three clawed digits with cream-colored webbing in-between. Its body is especially adapted to have a hydrodynamic shape, and it has a long tail that it uses as a rudder to steer. Golduck is sometimes mistaken for the Japanese monster, and physical inspiration for Golduck, the Kappa due to its general humanoid shape, beak, and webbed hands and feet.
Golduck is a fast swimmer, being capable of out-swimming even the most athletic of humans because of its webbed appendages. Even rough seas do not hamper this Pokémon's swimming abilities, and it will sometimes rescue people from shipwrecks. The gem on its forehead glows when it uses its psychic powers, and occasionally when it swims at full speed. In the past, this Pokémon was overhunted due to the belief that the gem granted people supernatural powers. As seen in the manga, Golduck has the ability to give knowledge to its Trainer and fellow Pokémon through telepathy. Golduck can typically be seen swimming in lakes, where it hunts fish. The prey is disabled, captured, and then brought to shore for consumption. Old tales claim Golduck punish those who defile their rivers by dragging them in and taking them away.
In Mewtwo Strikes Back and its remake Mewtwo Strikes Back—Evolution, Fergus's Golduck was captured and cloned by Mewtwo. The Golduck clone reappeared in Mewtwo Returns.
In Bye Bye Psyduck, Misty thought that her Psyduck had evolved into a Golduck. However, it turned out that the Golduck was just a wild Pokémon that happened to act like Brock because of the Golduck's "showing-off" attitude towards girls.
In Love, Totodile Style, Trixie uses a Golduck in her circus. It was also the boyfriend of an Azumarill that Ash's Totodile fell in love with.
In The Perfect Match, Trinity used a Golduck in her battle against a Pokémon Trainer and his Feraligatr during the finals of the Whirl Cup. After dealing with an attack by Team Rocket, Golduck was shown being defeated.
In Shocks and Bonds, Katie used a Golduck in her battle against Ash. It defeated Torkoal after her Venomoth disabled Torkoal's Iron Defense attack. In the following episode, Golduck was defeated by Corphish despite it being confused.
In Like It or Lup It!, a Golduck led a group consisting of a Poliwag, Wooper, and Quagsire, whose Berries were stolen.
In The Power of Us, Callahan caught a Golduck in a special blue Poké Ball for the Pokémon Catch Race, saving a Sudowoodo from it in the process.
In Pikachu's Vacation, a Golduck was at the Pokémon Theme Park.
In The Power of One, multiple Golduck sensed the disturbance caused by Lawrence III.
A Golduck appeared in the Japanese credits of Pikachu's Rescue Adventure.
In Wired for Battle!, a Trainer's Golduck came up as an image in Shingo's laptop.
In The Fire-ing Squad!, ten Golduck competed in the Fire and Rescue Grand Prix.
In Hook, Line, and Stinker, a Trainer's Golduck participated in the annual Seaking Catching Competition.
In Ring Masters, a Golduck competed in Rikishii Town's Sumo Conference.
In Around the Whirlpool, a Golduck was stolen from the Pokémon Center of Blue Point Isle.
In Octillery The Outcast and Dueling Heroes, a Trainer's Golduck competed in the Whirl Cup.
A Golduck appeared in a flashback in Hi Ho Silver... Away!, under the ownership of a crew.
In The Legend of Thunder!, a Golduck was at a Pokémon Center.
A Golduck appeared in Pokémon Heroes: Latios & Latias, under the ownership of a competitor in the Tour de Alto Mare.
In Abandon Ship!, a Golduck lived in the Abandoned Ship.
In A Double Dilemma, a Golduck lived at North Petalburg.
In Saved by the Beldum, a Golduck was at the Ever Grande Conference.
In Numero Uno Articuno, Noland's Golduck lived at the Battle Factory.
A Golduck appeared in the opening sequence of Lucario and the Mystery of Mew.
A Golduck appeared in Jessie's fantasy in One Big Happiny Family!.
A Trainer's Golduck appeared in a flashback in Alola to New Adventure!.
In Rocking Clawmark Hill!, two Golduck were training on Clawmark Hill.
In I Choose Paradise!, a Trainer's Golduck was at the Pokémon Paradise Resort.
In Evolving Research!, a Golduck was at Vast Poni Canyon. Sophocles tried battling it with Charjabug, only for Togedemaru to defeat it.
In Battle Royal 151!, a Trainer's Golduck competed in the Battle Royal preliminary round of the Manalo Conference but ended up losing.
||Golduck, the Duck Pokémon. The evolved form of Psyduck. Golduck is very adept at using its webbed hands and feet, making it the fastest swimming Pokémon of all.
||Golduck, the Duck Pokémon. It makes its home in lakes, and is able to swim faster than a gold medalist.