Dewgong is a pinniped Pokémon with a snowy white, furry body. Its fur renders it virtually invisible in snowy conditions. Its face has two black eyes, a black nose, and two tusks extending from its upper jaw. It has a streamlined body with two front flippers and a long flowing tail. Even in extremely cold and ice-packed waters, its tail allows it to be a swift and agile swimmer at speeds of 8 knots. On top of its head is a sharp horn, which allows it to cut through the thickest ice floes.
It lives on icebergs adrift in frigid ocean waters. It thrives in lower temperatures, becoming increasingly more active the colder the weather. By storing thermal energy within its body, it is completely unharmed by even the most intense freezing weather. During daylight hours, it sleeps on bitterly cold ice or under shallow water. However, at night when the temperature drops, it becomes a hunter and searches for prey such as Wishiwashi. Following a meal, it sunbathes on the beach. This raises its body temperature and aids in digestion.
Evolution
Dewgong evolves from Seel.
(For specifics on this Pokémon's Evolution in the games, refer to Game data→Evolution data.)
Main series
Major appearances
The Seel belonging to the Cerulean Gym evolved into a Dewgong in The Misty Mermaid, thus also marking the species' debut.
In A Test in Paradise!, Goh caught a Dewgong. It has a tendency to fall in love easily.
Other
In Mewtwo Strikes Back, Neesha first used a Dewgong to travel to New Island. It was later captured and cloned by Mewtwo. The Dewgong clone reappeared in Mewtwo Returns. Neesha's Dewgong reappeared in Mewtwo Strikes Back—Evolution, a remake of Mewtwo Strikes Back, where it played the same role.
A Dewgong appeared under the ownership of Pryce in Rage of Innocence, As Cold as Pryce, and Nice Pryce Baby. It was first used in an unofficial battle against Ash's Phanpy and won. It was later defeated by Cyndaquil during Ash's official Gym battle with Pryce.
In Up Close and Personable!, a Dewgong lived in the lake near the Pokémon Summer Academy. Ash and Angie stumbled upon it, and Ash decided to use the opportunity to draw it.
Minor appearances
In Showdown at the Po-ké Corral, multiple Dewgong were living at Professor Oak's Laboratory. They reappeared in The Rivalry Revival.
In Pikachu's Vacation, a Dewgong was at the Pokémon Theme Park.
In The Joy of Pokémon, a Dewgong living at an unnamed island played with Ash, but it almost caused him to drown in the process.
In The Mandarin Island Miss Match, Prima used her Dewgong to battle and defeat a Trainer's Marowak.
In The Power of One, multiple Dewgong sensed the disturbance caused by Lawrence III.
A Dewgong appeared in a fantasy in The Totodile Duel.
A Dewgong appeared in Snorlax Snowman.
Multiple Dewgong appeared in the opening intro of Celebi: The Voice of the Forest, which was reused for Pokémon Heroes: Latios & Latias.
In The Joy of Water Pokémon, two Dewgong were living in Lake Lucid, while a third was receiving special treatment in a salt bath tank in the Pokémon Center located near the lake.
In Around the Whirlpool, a Dewgong was stolen from the Pokémon Center of Blue Point Isle.
In The Legend of Thunder!, a Dewgong was at a Pokémon Center.
In Nice Pryce Baby, Pryce owns multiple Dewgong other than the one he used for battle. They were kept at the Mahogany Gym.
Multiple Dewgong appeared in Destiny Deoxys.
A Coordinator's Dewgong appeared in Harley Rides Again.
In Pokémon Ranger and the Temple of the Sea, Kyle was shown to own a Dewgong, which participated in the Marina Group's water shows.
In PK19, a Dewgong was on the icy island.
In Dawn of a Royal Day!, a Coordinator's Dewgong competed in the Arrowroot Town Pokémon Contest.
A Dewgong appeared in the opening sequence of Zoroark: Master of Illusions.
A Dewgong appeared in I Choose You!.
In Alola, Kanto!, a Dewgong played with the balloon that Lana's Popplio created.
A Dewgong appeared in The Power of Us.
In Legend? Go! Friends? Go!, three Dewgong were underwater outside Vermilion City.
In The Sinnoh Iceberg Race!, a Trainer's Dewgong competed in the Pokémon Iceberg Race.
In A Test in Paradise!, a Dewgong caught the attention of Goh's Dewgong, causing it to fall in love and chase after it, leading its Trainer and Ash into a storm.
Three Dewgong appeared in This Could be the Start of Something Big!.
A Dewgong appeared in The Pendant That Starts It All (Part One).
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP061
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Dewgong
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Ash's Pokédex
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Dewgong, the Sea Lion Pokémon. The evolved form of Seel. This Water/Ice Pokémon can easily resist extreme cold.
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Pokémon Origins
In File: 4 Charizard, Lorelei used a Dewgong in the Pokémon League, where it battled Red and lost.
Pokémon: Twilight Wings
In Early-Evening Waves, multiple Dewgong were residents of a lake where Nessa was doing a photoshoot.