Slowking first appeared in The Power of One, narrating the Shamouti Prophecy. He was then seen observing the bad weather occurring after Moltres's capture. Following Zapdos's capture, Slowking witnessed Articuno freezing an island.
When Ash, his friends, Team Rocket, and Melody arrived to the Shamouti Shrine, they met Slowking who told Ash where to put the spheres he found. As Ash only found the Fire and Thunder Spheres, Slowking pointed out that he was one short. Slowking then saw the fighting between Lugia and the legendary birds. While Ash went ahead to get the Ice Sphere, Slowking stayed behind with Misty, Tracey, and Melody.
After Ash returned with the final sphere, Slowking witnessed Melody revive Lugia and undo the damage done on the island. When Team Rocket survived their fall, Slowking praised them for saving the world and their heroic actions did not go unnoticed.
Slowking appeared again in Slowking's Day, which showed what he does on a daily basis. It was revealed that his interests include coconuts, taking walks, flowers, afternoon naps, the ocean, friends, and the sunset.
Slowking also made a cameo appearance in I Choose You!, which is set in a timeline separate from the main series. It was seen still residing at the Shamouti Shrine.
Slowking was featured in the TCG as one of Hama-chan's Pokémon. Hama-chan is the nickname of Japanese comedian Masatoshi Hamada, who was Slowking's Japanese voice actor.
The following is a list of cards named Hama-chan's Slowking.
Hama-chan's Slowking 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.