Wailmer is a spherical whale Pokémon with no tail. It has a dark blue topside and a tan underbelly with grooves. It has two fins that have finger-like appendages, baleen plates that resemble teeth, and a blowhole on the top of its head.
Wailmer stores water inside its body, which it expels through its nostrils to startle people. When storing water in its body, it can turn into a bouncing ball. The more water filling its body, the higher it can bounce. It becomes lethargic when it is dry. It swims with its mouth open and eats tons of food a day, such as Wishiwashi. It lives in the sea, and can only live on land for a short amount of time. It occasionally bounces onto the beaches to play. On rare occasions,
pods can be seen washed up on shore due to memories of once living on land. Dhelmise along with Sharpedo are natural predators to Wailmer.
In the main series
Major appearances
A Wailmer 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.
A Wailmer appeared in Island Time. It befriended Robin, a man who was living on an uncharted island. The Ball Whale Pokémon eventually evolved into a Wailord in order to transport Robin, Ash, and his friends to a ship heading to Ever Grande City. However, Robin later decided that he wanted to go back to the island.
A Coordinator's Wailmer appeared in Pruning a Passel of Pals!, where it was seen taking part in the Battle Stage of the Wallace Cup. It went up against Dawn's Buneary and lost, allowing Dawn to advance forward in the Contest.
A Wailmer appeared in Leading a Stray!. It was trapped in the sewers, but it was rescued by Ash, who later helped it rejoin its family in the ocean. It evolved into a Wailord in the same episode.
Two Poké Ride Wailmer appeared in Yo, Ho, Ho! Go, Popplio!, both of which Professor Kukui, Kiawe, and Sophocles used to travel around Melemele Island.
A Wailmer appeared in The Island Whisperer!, where it was attacked by a Bruxish's Psychic powers and was subsequently stuck in-between a rock formation in the sea.
Minor appearances
Wailmer debuted in a cameo in Pikachu's PikaBoo.
A Wailmer appeared in Pokémon Heroes: Latios & Latias, under the ownership of Ross. It was used during the Tour de Alto Mare, where it and Ross came in second while Misty and her Corsola came in first by a mere centimeter.
Two Wailmer made their main series debut in Johto Photo Finish, during Harrison's explanation of the Hoenn region.
Multiple Wailmer made a cameo appearance in Hoenn Alone!, where they were seen swimming in the ocean.
A Wailmer appeared in the opening sequence of Destiny Deoxys.
Multiple Wailmer appeared in Clamperl of Wisdom as some of the Pokémon living at Maisie Island.
Three Wailmer appeared in The Relicanth Really Can.
Multiple Wailmer appeared in The Evolutionary War.
Multiple Wailmer appeared in Pokémon Ranger and the Temple of the Sea. They were among the Pokémon present during the final showdown with The Phantom and his crew.
Multiple Wailmer made a brief cameo appearance in Giratina and the Sky Warrior.
A Wailmer appeared in One Team, Two Team, Red Team, Blue Team!, under the ownership of the Pokémon Summer Academy. It was used by one of the students in the second leg of the Pokémon Triathlon.
Multiple Wailmer appeared in a cameo in Kalos, Where Dreams and Adventures Begin!.
Multiple Wailmer appeared in Diancie and the Cocoon of Destruction.
A Wailmer appeared in Alola to New Adventure!.
Three Wailmer appeared in a fantasy in Yo, Ho, Ho! Go, Popplio!.
A Wailmer appeared in Filling the Light with Darkness!, during a fantasy of a story from the past. It reappeared in a similar fashion during The Prism Between Light and Darkness!.
A Wailmer appeared in Securing the Future!, where it joined the rest of Alola in showering Necrozma with light so it could return to its normal form.
A Wailmer appeared in Pikachu's Exciting Adventure!.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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AG124
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Wailmer
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Ash's Pokédex
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Wailmer, the Ball Whale Pokémon. Wailmer loves to startle people by storing water inside its body, then expelling it through its nostrils.
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Episode
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Pokémon
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Source
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Entry
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DP109
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Wailmer
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Ash's Pokédex
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Wailmer, the Ball Whale Pokémon. It spouts water out of its nose and becomes lethargic when its body becomes dry.
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In Pokémon: Twilight Wings
Two Wailmer appeared in Early-Evening Waves as residents of a lake where Nessa was doing a photo shoot.