Major appearances
Gary's Eevee was revealed to have evolved into an Umbreon some time before Power Play!.
Other
An Umbreon appeared in Trouble's Brewing and Espeon, Not Included, under the ownership Tamao, one of the Kimono Sisters. It rescued Sakura's Eevee from Team Rocket when they disrupted the Kimono Sisters' tea ceremony.
Top Coordinator Johanna owns an Umbreon, which debuted in Strategy Begins at Home!. In this episode, it was used in a two-on-two Contest Battle alongside Glameow, where they went up against Dawn's Piplup and Pachirisu. Umbreon was later seen in Challenging a Towering Figure! at the start of the Festival Battle Challenge. It later reappeared in SS024, where it participated in a battle against Piplup and Cyndaquil, before the match was called off.
An Umbreon debuted in Team Eevee and the Pokémon Rescue Squad!, along with an Eevee and its evolved forms at the time, under the ownership of Virgil. In a flashback, it was revealed that it evolved from an Eevee when it and Virgil got lost in a forest and had to spend a night there. Umbreon then reappeared in Lost at the League! and Strong Strategy Steals the Show!, and in a flashback in Curtain Up, Unova League!.
An Umbreon appeared in Eevee & Friends with an Eevee and its evolved forms, including the newly introduced Sylveon. It has a mysterious personality and is friends with a Weavile, Gible, Gothita, Gothorita, and Gothitelle.
An Umbreon appeared in A Glaring Rivalry!, under the ownership of Gladion. It later reappeared in Rising from the Ruins!, A Dream Encounter!, A Masked Warning!, and Mission: Total Recall!. It was often seen outside of its Poké Ball.
A Trainer's Umbreon appeared in Turning Heads and Training Hard!, where it was summoned to help Ilima's Eevee perform Extreme Evoboost. It reappeared in the Poké Problem segment of the next episode, where it saw Ilima and Eevee off.
Minor appearances
An Umbreon appeared in Gary's demonstration in Johto Photo Finish, where it evolved from an Eevee.
An Umbreon appeared in Brock's demonstration in A Bite to Remember, where it evolved from an Eevee.
An Umbreon appeared in A Fan with a Plan.
Multiple Umbreon appeared in Destiny Deoxys.
An Umbreon made a small cameo appearance in the opening sequence of Giratina and the Sky Warrior together with an Eevee and the other six Eeveelutions at the time.
An Umbreon appeared in The Battle Club and Tepig's Choice! as an image in the Pokédex. The device had mistaken a blackened-up Tepig, which broke out of a warehouse, for it.
An Umbreon appeared in a fantasy in Tag Team Battle Inspiration!, where Serena imagined what her Eevee could evolve into.
Two Umbreon appeared in The First Day of the Rest of Your Life!, each under the ownership of a Trainer.
Three Umbreon appeared in The Power of Us, with one under the ownership of a Trainer, the second being wild, and the third appearing during a flashback.
A Trainer's Umbreon appeared in I Choose Paradise!, where it was among the Pokémon seen at the Pokémon Paradise Resort.
A Trainer's Umbreon appeared in SM099.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP171
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Umbreon
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Ash's Pokédex
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Umbreon, the Moonlight Pokémon. When an Eevee has had sufficient training and is exposed to moonlight, it evolves into an Umbreon.
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Episode
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Pokémon
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Source
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Entry
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BW004
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Umbreon
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Ash's Pokédex
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Umbreon, the Moonlight Pokémon, and an evolved form of Eevee. The rings of Umbreon's body glow faintly when exposed to the moon's aura, and it gains a mysterious power.
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BW102
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Umbreon
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Ash's Pokédex
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Umbreon, the Moonlight Pokémon. The rings in its fur glow when the moon shines on them.
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In the Pokémon Adventures manga
In The Last Battle VII, Karen is seen with an Umbreon as the cornerstone of her team, as in the games. It apparently evolved from the Eevee she had since her childhood.
Greta of the Battle Arena is seen using an Umbreon in her battles with Guile Hideout and Emerald, during which it easily defeats his Dusclops before falling to his Sudowoodo, which goes on to win the match, earning him the Guts Symbol. It first appeared in Swanky Showdown with Swalot.
An Umbreon appeared in Pleased as Punch With Parasect, owned by a Kimono Girl.
An Umbreon appeared in a fantasy in the X & Y arc.
In the Pokémon Colosseum Snatcher Leo manga
Similar to the games, Wes owns an Umbreon which debuted in CSL1.
In the Pokémon Colosseum Snatchers manga
An Umbreon appeared under the ownership of Wes which first appeared in PCS1.
In the Pokémon Gold & Silver: The Golden Boys manga
In The Golden Boys, Bill has both an Umbreon and its counterpart, Espeon.
In the Pocket Monsters HGSS Jō's Big Adventure manga
An Umbreon appeared in JBA5, owned by Karen.
In the Pokémon Pocket Monsters manga
An Umbreon appeared in A Challenge to the Elite Four, under the ownership of Karen.
Origin
Umbreon's origins are uncertain, though it could be based on a black cat, which was considered to be an omen of bad luck (in Western countries, contrary to Japan's viewpoint in which they considered it lucky), and can be interpreted as the reasoning behind the Dark typing. Its long ears are similar to those of a hare and may originate from the East Asian legends concerning a Moon rabbit. The rings on Umbreon's body resemble Egyptian lunar markings and jewelry that have been associated with animal sculptures, such as cat statues of the Egyptian goddess Bastet. While Bastet was originally a lioness warrior and the goddess of the sun, Greeks occupying ancient Egypt toward the end of its civilization changed her into the goddess of the moon. This change may have drawn some of the inspiration for the Pokémon's lunar theme.
Name origin
Umbreon is a combination of umbra (Latin for shadow and ghost, as well as the English word for the moon's silhouette during a solar eclipse) and eon, a shortened form of evolution, the word also meaning an immeasurably long period of time (possibly referring to how long evolution takes naturally). Eon is a suffix all Eevee evolutions share and was Eevee's English prototype name.
Blacky may be a combination of black and lucky, attributing the black cat in Japan that is considered lucky. It may also refer to the color of its coat.