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  In early English promotional material for Pokèmon Red and Blue, Eevee was called "Eon", the suffix of all the evolutions of Eevee.

The fanmade term to describe the evolutions of Eevee, "Eeveelutions", was made official afters its use in the strategy guide for Pokèmon Stadium 2, followed by a TCG Theme Deck.

  In Pokèmon Ranger, all of Eevee's evolutions up to the third generation can be captured; however, Eevee cannot even be found at all. This was changed in Pokèmon Ranger: Shadows of Almia.

  Eevee's name is a palindrome; it shares this distinction with Girafarig, Ho-Oh and Alomomola.

  Despite the fact that May, Gary and Sakura each owned an Eevee that went on to evolve, Eevee was never seen evolving on screen in the anime until 'Last Call - First Round!', when Ursula evolved her two Eevee into Flareon and Vaporeon during a contest appeal, over thirteen years into the series.

  Four of Eevee's evolutions evolve through abnormal means in the Pokèmon Mystery Dungeon series (Espeon, Umbreon, Leafeon and Glaceon)

  In the Pokèmon Mystery Dungeon Series, Eevee evolves using the Sun Ribbon or Lunar Ribbon with at least 1 star of IQ, a Mossy Rock or a Frozen Rock into its respective evolutions.

  It is impossible for Eevee to evolve into Leafeon and Glaceon in Pokèmon HeartGold and SoulSilver since neither Johto nor Kanto has a Moss Rock or an Ice Rock.

  Despite Eevee being obtainable before the Pokèmon League in Pokèmon Black and White Versions 2, it cannot evolve into Leafeon or Glaceon until after the Elite Four are defeated. This is because Twist Mountain and Pinwheel Forest are inaccessible before then.

  Eevee has the most evolutions of any non-glitch Pokèmon and is the only non-glitch Pokèmon and is the only non-glitch Pokèmon which has more than three evolutions)

Eevee is the only pre-existing Pokèmon to receive an evolution in Generation VI, though many received Mega-Evolutions.

Vaporeon

  Vaporeon is the only Water-type that appears in the field section of Pal Park.

  In Generation I, Vaporeon had a notable different design with the backs of its ears being all black, fins on each leg and a fin running down the entire length of its back. All of these details were removed in Generation II. Notably these details weren't present in its original Pokèmon Red and Green artwork.

  In Pokèmon Yellow, Vaporeon is programmed to learn both Haze and Mist at Level 42; however, a bug prevents a Pokèmon from learning two moves at the same level, so Vaporeon cannot learn Mist in Yellow.

 Jolteon

  Jolteon shares its category name with Electrike. They are both known as the lightning Pokèmon.

Jolteon and Zapdos' Japanese names are almost exactly the same as each others, with a final 's' being the only difference. (Thunders and Thunder are their Japanese names)

Flareon

  Flareon shares its category name with Charmeleon, Charizard, Moltres and Infernape. They are all known as the flame Pokèmon.

  Flareon has the highest Special Defense base stat of all non-legendary Fire-type Pokèmon.

Espeon

  Espeon is not obtainable in FireRed and LeafGreen, due to the lack of a time system. In order to be obtained and added to the Pokèdex in these versions, an Eevee must be traded to Ruby, Sapphire and Emerald versions, evolved, and then traded back or be traded from Pokèmon Colosseum or XD.

  Espeon shares its category name with Sunflora and Volcarona. They are all known as the Sun Pokèmon.

UmbreonFile:Spr 3e 197.pngFile:Spr 3e 197.png

  By national Pokèdex order, Umbreon is the first Dark-type Pokèmon, excluding mega Gyarados.

  Umbreon was the only pure Dark-type Pokèmon in its debut Generation.

  Eevee cannot be evolved into Umbreon in FireRed or LeafGreen, just like Espeon, again, due to the lack of time system.

  In Pokèmon Stadium 2, Pokèmon Colosseum and Pokèmon XD, Umbreon glows between its regular and shiny colour versions.

  According to the Diamond and Pearl Pokèdex, Umbreon, Glaceon and Leafeon have identical footprints.

  Despite appearing many times, no Umbreon in the anime has ever been seen using any Dark-type moves.

  Umbreon is the only non-Psychic-type Pokèmon to be able to have the ability to synchronise.

LeafeonSpr 5b 470.pngSpr 5b 470.png

  According to the Diamond and Pearl Pokèdex; Leafeon, Glaceon and Umbreon have identical footprints.

  As there is no Moss Rock in HeartGold and SoulSilver, it is impossible to evolve Eevee into a Leafeon in these games. The same applies for Magnezone, Probopass and Glaceon. They all have to be traded from Pokèmon Diamon, Pearl and Platinum to be obtained.

  Despite Eevee being obtainable before the Pokèmon League in Pokèmon Black and White Versions 2, it can evolve into Leafeon until after the Elite Four are defeated. The same applies with Glaceon.

GlaceonSpr 5b 471.pngSpr 5b 471.png

  Glaceon's Japanese name is the same as the English name of a member of the Hoenn Elite Four.

  According to the Diamond and Pearl Pokèdex, Glaceon, Leafeon and Umbreon have identical footprints.

As there is no Ice Rock in HeartGold and SoulSilver it is impossible to evolve Eevee into a Glaceon in these games. The same applies to Magnezone, Probopass and Leafeon. They all have to be traded from Pokèmon Diamond, Pearl and Platinum to be obtained.

Despite Eevee being obtainable before the Pokèmon League in Pokèmon Black and White Versions 2, it can evolve into Glaceon until after the Elite Four are defeated. The same applies with Leafeon.

Glaceon share its category with Vanillite. They are both known as the Fresh Snow Pokèmon.

Sylveon

  According to a Ken Sugimori interview with the Famitsu Magazine, Sylveon was designed by Atsuko Nishida,

  Sylveon is the only cross-generational evolutionary relative introduced in Generation VI.

  Sylveon is the only Eeveelution to be introduced alone in an individual generation.