Goldeen has proved helpful when Misty and her friends need assistance swimming or locating something underwater. In Pokémon Shipwreck, Goldeen tried to find an exit out of the sunken St. Anne. Instead, it discovered Team Rocket, who would otherwise have drowned, and brought them to the surface. Later, Goldeen towed Misty to the surface, while Starmie and Squirtle followed behind with Ash and Brock. It was later sent out to attempt to drag the raft away from James's Gyarados, but they were all caught up in the Dragon Rage and sent flying. It reappeared in Tentacool & Tentacruel, where it helped Staryu and Starmie rescue sailors who had been attacked.
Misty did not use Goldeen very often because it cannot battle or maneuver outside of water. When it was called out, it often did poorly due to its lack of battle experience. An example of this is a battle against Marina in Bye Bye Psyduck, where it lost to her Tentacruel, before Misty's Staryu took over and won.
In Snack Attack, Goldeen was sent out in an attempt to fight a wild Snorlax, but it was completely helpless and was almost eaten before being recalled.
Goldeen fought Dorian's Qwilfish in Just Add Water, managing to land a Horn Attack after dodging Qwilfish's Tackles with Agility. Goldeen then used Supersonic, but Qwilfish shrugged off its effects and fired Pin Missile. Goldeen managed to reflect those coming its way by spinning its tail. Goldeen aimed a Horn Drill, which Qwilfish dodged. Qwilfish used another Pin Missile, hammering Goldeen from behind. A final Take Down was enough to knock Goldeen out and win the round for Dorian.
Goldeen is shown to be quite strong and fast, often being called upon to transport Misty or others in the water. In a true testament to its strength, Goldeen rescued the Team Rocket trio when they were trapped and drowning aboard the capsized St. Anne during Pokémon Shipwreck.
Goldeen wasn't seen very often due to it being a water-bound species, flailing when displaced from it. However, in water, Goldeen's potential shone through. Goldeen was shown to know a variety of techniques that has helped it defeat other Pokémon, such as Victreebel in The Stun Spore Detour. Its incredible Agility and deadly Horn Attack were amongst its best technique, though it was overwhelmingly a physical attacker. Goldeen faced difficulties against other Water-type specialists like Marina in Bye Bye Psyduck and Dorian in Just Add Water.
Misty's Goldeen Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.