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At Porta Vista, Brock, Ash, and Misty were trying to return to the mainland when Misty noticed an injured Horsea near the coast. The little seahorse squirted out a warning in ink that the children didn't understand.
Later, the group learned that a woman named Nastina was trying to build an underwater resort in the local reefs, and that her workers were being attacked by many Tentacool. A strange chain of events lead to the community being attacked by a gigantic Tentacruel, who was angry at the humans demolishing the reef. Horsea and Misty's pleading saved the city, and Horsea then joined Misty's team.
Much later, in The Misty Mermaid, Horsea was feeling ill because Misty wasn't letting him out enough to get any exercise. With no ocean nearby, Misty decided to take him home to Cerulean City, where he could play and swim in her Gym's many aquariums. After participating in a water ballet, Misty left Horsea and her Starmie in the care of her sisters.
As shown in his debut, Horsea prefers to use words before battling head on as he tried to explain to the giant Tentacruel that violence wouldn't solve anything. Horsea, like Goldeen, has trouble functioning on land, so Misty didn't use him much in her adventures. However, when he was used, he tended to be very resourceful - using ink to draw pictures or leave trails. He, like the rest of his species, preferred large bodies of water to swim in. However, because of only being able to swim in small puddles of water, he became sad and ill. Luckily, once he was left in the Cerulean Gym with Misty's Sisters, and Misty saw how happy he was with the pool's size she decided to leave him there. When Misty returned to the gym in Cerulean Blues, Horsea happily greeted her along with Starmie, but was later scared away by Gyarados.
Horsea was featured in the TCG as one of Misty's Pokémon. The following is a list of cards named Misty's Horsea.
Misty's Horsea Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a green background are legal to use in both the current Standard and Expanded formats.