Major appearances
Lanturn debuted in The Mystery is History, under the ownership of Oliver. He often uses it to swim on water. He also used it to play with a baby Lugia nicknamed Silver, which it befriended. It has since made further appearances in A Parent Trapped! and A Promise is a Promise.
A Lanturn appeared in Just Add Water, under the ownership of Dorian. Dorian used it to battle Ash and won after defeating his Totodile.
A Lanturn appeared in Lapras of Luxury, under the ownership of Naomi. Its Supersonic waves helped her locate singing voices of a group of Lapras.
A Lanturn appeared in Pruning a Passel of Pals!, under the ownership of Kyle. It and its Trainer were participating in the Wallace Cup, and it defeated Ash's Buizel in a battle.
Minor appearances
A Lanturn appeared in The Legend of Thunder!, where it was seen swimming in a lake.
Multiple Lanturn appeared in Enlighten Up! as residents of Lake Slowpoke.
A Lanturn appeared in Pokémon Heroes: Latios & Latias, under the ownership of a competitor in the Tour de Alto Mare.
Multiple Lanturn appeared in Destiny Deoxys.
Multiple Lanturn appeared in Pokémon Ranger and the Temple of the Sea. They briefly reappeared in a montage in The Rise of Darkrai, which chronicled the preceding nine movies.
Multiple Lanturn appeared in Kalos, Where Dreams and Adventures Begin!.
A Lanturn appeared in a fantasy in Clemont's Got a Secret!.
Multiple Lanturn appeared in Going for the Gold!, where they were among the Pokémon seen in the Ambrette Aquarium.
A Lanturn 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 Lanturn appeared in SM126.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP220
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Lanturn
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Ash's Pokédex
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Lanturn, the Light Pokémon. The light that emits from its tentacle-like limb shines bright enough to illuminate the bottom of a deep sea.
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Episode
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Pokémon
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Source
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Entry
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DP078
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Lanturn
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Dawn's Pokédex
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Lanturn, the Light Pokémon, and the evolved form of Chinchou. Lanturn's antenna light is strong enough to penetrate the ocean, and can be seen on the water's surface.
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Origin
Bulbanews has an article related to this subject:
It is based on an anglerfish, more specifically the footballfish, although it shares some similarities with dolphins. It is also possible that Lanturn's origin contains a small piece of the Hellenistic god, Apollo. He was the god of light and his animal was the dolphin.
Name origin
Lanturn is a corruption of lantern. It may also be a combination of lantern and turn (as in "turn on the light").
Lantern is literally lantern.