The Eeveelutions are a highly popular set of Pokemon, all of which evolve from Eevee - Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, and Sylveon. Each Eeveelution belongs to a specific element, with the non -eon portion of their name reflecting it (i.e. the Water-type Vapreon's name refers to water vapor). They were a common presence on YouChew, with numerous members using the creatures as their motifs. Notable examples include TheChutley with Glaceon and MycroProcessor with Jolteon.
The Eeveelutions appeared as YouChew Trading Card #79. At the time, there was no picture in official Pokemon media of all the Eeveelutions in one scene, so original art by Combuskenisawesome was created for the card. After the YouChew Trading Card project was completed, the Eeveelutions appeared together in offical media as part of Eevee's Z-Move Extreme Evoboost.