Seadra is a light blue, seahorse-like Pokémon with a cream-colored belly covered in rough scales. It has a long, tubular mouth, narrow, black eyes, a fin-like ridge above each eye, and spiny pectoral fins. It also has a large, coiled tail. It has a pair of dorsal fins with sharp, cream-colored tips that exude venom. Seadra's venom is toxic enough to induce fainting in humans, but is prized among practitioners of traditional medicine.
Seadra can swim in any direction while facing forward by rapidly flapping its fins and tail. It catches its prey by spinning its body to create large whirlpools. When its prey is exhausted, Seadra swallows it whole using its long snout. Seadra makes its nest by either wriggling between or anchoring itself to branches of coral under the ocean. After a female Seadra gives birth, the male Seadra will take care of the young. It is markedly vicious and will mercilessly attack those who venture near its nest.
In the main series
Major appearances
Seadra debuted in Mewtwo Strikes Back, under the ownership of Fergus. It was one of the Pokémon that were captured and cloned by Mewtwo. The Seadra clone reappeared in Mewtwo Returns. Fergus's Seadra reappeared in Mewtwo Strikes Back—Evolution, a remake of Mewtwo Strikes Back, where it played the same role.
Seadra made its main series debut in Round One - Begin!, under the ownership of Mandi. He used it while facing Ash during his first battle in the Indigo Plateau Conference. Seadra battled Kingler and was subsequently defeated. It reappeared in a flashback in the following episode.
A Seadra appeared in Fit to be Tide, under the ownership of Cissy. She used it while Ash was participating in her target test. It had a notably sensitive personality. It competed against Squirtle, but the match was declared a tie. Seadra reappeared in a flashback in A Way Off Day Off.
A Seadra appeared in The Great Eight Fate!, under the ownership of Juan. It was one of his Pokémon used in the Sootopolis City Water Exhibit. It and Juan's other Pokémon were captured by Team Rocket, but they all worked together to escape.
Minor appearances
A Seadra appeared in Pikachu's Vacation as one of the Pokémon seen at the Pokémon Theme Park.
A Seadra appeared in The Power of One.
A Trainer's Seadra appeared in Hook, Line, and Stinker, where it was used to aid him in the annual Seaking Catching Competition.
A Seadra appeared in Snorlax Snowman.
Three Seadra appeared in The Joy of Water Pokémon. Two were living in Lake Lucid, while the other one was receiving special treatment in a salt bath tank in the Pokémon Center located near the lake.
A Seadra appeared in The Legend of Thunder! as one of the Pokémon seen at a Pokémon Center.
A Seadra appeared in Pokémon Heroes: Latios & Latias, under the ownership of a competitor in the Tour de Alto Mare.
Two Seadra appeared in The Relicanth Really Can.
A Seadra appeared in Pokémon Ranger and the Temple of the Sea, where a Manaphy Egg bounced on its head while adrift in the ocean.
Multiple Seadra appeared in Kalos, Where Dreams and Adventures begin!.
A Seadra appeared in I Choose You!.
Two Seadra appeared in Alola, Kanto!, where they were among the Pokémon seen at Professor Oak's Laboratory. Another Seadra appeared during a fantasy that Lana had on the Pokémon she hoped to see in Kanto.
A Seadra appeared in SS002.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP075
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Seadra
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Ash's Pokédex
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Seadra, a Dragon Pokémon. The evolved form of Horsea. Seadra has a violent temperament, and the quills that cover its body can render its victim unconscious.
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Episode
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Pokémon
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Source
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Entry
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EP085
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Seadra
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Ash's Pokédex
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Seadra, the Dragon Pokémon. It is known for its powerful disposition, but possesses both strength and speed.
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In Pokémon Origins
A Seadra appeared in File 3: Giovanni, under the ownership of a Swimmer whom Red defeated in a battle.