Mareep is a sheep-like Pokémon with fluffy cream-colored wool covering its entire body, as well as a curly tuft of wool in the middle of its head. Its head is blue, and it has black eyes. Its four feet are blue and have two digits on each foot, and it appears to be on tiptoe at all times. Its conical ears and tail have a yellow-and-black striped pattern. Mareep has an orange sphere at the end of its tail, which acts like a small light bulb. This sphere glows brighter the more electricity it has.
Mareep's wool, which grows continuously, stores electricity, rubbing together and building a static charge. Its volume increases when it builds up with electricity. Touching the wool when it is charged will result in a static shock. During the summer, the fleece is shed, but it grows back in a week. Air is also stored in its fur, which allows it to stay cool during summer and warm during winter. It tends to avoid battle in the wild and has a mild disposition. Mareep is most often found in grassy fields, though it can also be found in farms where its wool is used in high-quality clothing.
Major appearances
Mareep debuted in Mild 'n Wooly, in which a flock was shepherded by a young girl named Mary and her mother. Mary had her own Mareep, which was nicknamed "Fluffy".
A Mareep appeared in A Chip Off the Old Brock, under the ownership of Katie. It is used to make potions at her pharmacy.
A herd of ten Mareep appeared in The Light of Floccesy Ranch!, under the ownership of Ellie. They reside at her farm and help her out with work.
Minor appearances
A Mareep appeared in Tricks of the Trade, under the ownership of one of the Trainers present at the Pokémon Swap Meet.
A Mareep was owned by Dr. Anna in Hassle in the Castle. She uses to uses Mareep's electricity to run a low-voltage muscle stimulator.
A Trainer's Mareep briefly appeared in Imitation Confrontation.
Multiple Mareep appeared in Houndoom's Special Delivery, under the ownership of a farmer.
Multiple Mareep were among the Electric Pokémon that were lured by the "Miracle Crystal" that Attila and Hun were using in The Legend of Thunder!.
Multiple Mareep appeared in Misty's flashback in Gotta Catch Ya Later!.
A Mareep appeared in the opening sequence of Lucario and the Mystery of Mew.
A Mareep appeared in Pruning a Passel of Pals!
A Mareep appeared in Sticking With Who You Know!.
Multiple Mareep appeared in Team Eevee and the Pokémon Rescue Squad!, where they were among the residents of a ranch at Virgil's house.
A Mareep appeared in Meowth's fantasy in Meowth, Colress and Team Rivalry!.
A Mareep appeared in SS027.
Multiple Mareep appeared in Kalos, Where Dreams and Adventures Begin!.
Two Mareep appeared in A Campus Reunion!.
Multiple Mareep appeared in A Race for Home!.
Four Mareep appeared in The Future Is Now, Thanks to Determination!, where they were among the Electric-type Pokémon being controlled by Team Rocket.
Multiple Mareep appeared in Dream a Little Dream from Me! in a dream.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP139
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Mareep
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Ash's Pokédex
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Mareep, the Wool Pokémon. Mareep store static electricity in their wooly coats. They avoid battles and have mild dispositions.
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Episode
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Pokémon
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Source
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Entry
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BW113
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Mareep
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Ash's Pokédex
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Mareep, the Wool Pokémon. When Mareep's wool builds up with static electricity, its size doubles.
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Origin
Mareep appears to be simply based on the lamb of a sheep. It is likely that its electric aspect and Ability comes from how wool builds up static charges and may also be based on the golden fleece in Greek and Roman mythology. It, and its evolutions, may also have been based on the title of the science fiction novel Do Androids Dream of Electric Sheep?.
Name origin
Mareep may be a combination of Mary (from the nursery rhyme "Mary Had a Little Lamb") and sheep. Mareep is also an anagram of ampere, a unit of electric current.
Merriep may be a combination of merry, メー mē (the sound made by sheep), or Mary and sheep.