Sylveon is a quadrupedal, mammalian Pokémon covered with pale cream-colored fur with pink feet, ears, and tail. It has light blue eyes, long ears with blue interiors and thicker fur, a tiny nose, and two stray tufts of fur on top of its head. There are two bows on its body: one at the base of its left ear and one at its neck. Each bow is pale cream with a pink center and trails a pair of ribbon-like feelers. The feelers are pale cream with light blue tips. Before the tip of each feeler is a pink and then a dark blue stripe. It has slender legs with small, three-toed paws and a fluffy, slightly curved tail.
Sylveon's ribbon-like feelers emit a soothing aura that erases any sense of hostility, enabling it to stop fights. When hunting, it swirls its feelers as a distraction while the aura weakens feelings of hostility in its prey, then pounces on the victim. It will also wrap its feelers around its Trainer's arm as they walk together, which allows it to read their feelings. As soon as a fight breaks out, Sylveon bravely charges at Dragon-type Pokémon much bigger than itself; in Galar, there is even a fairy tale about a Sylveon that managed to defeat a Dragon Pokémon.
Sylveon appears as a trophy in both versions of the game.
Sylveon is one of Eevee's various final evolutions. It has a lot of great attacks to use in battle, but it actually seems to be a peace-loving sort of Pokémon. Case in point, it can completely stop the flow of battle by moving its ribbonlike feelers in a way that charms its opponents into not wanting to fight anymore.
This Pokémon was unavailable prior to Generation VI.
Sylveon has the lowest base Speed stat of all Eeveelutions.
In contrast to the rest of the Eeveelutions' pointed ears, Sylveon's ears are large and rounded, giving it a resemblance to rabbits. Fairies were thought to be particularly active under the light of the full moon; because of this and the rabbit association, Sylveon could be based on the mythical Asian moon rabbit. The moon rabbit is often portrayed as a companion of the Chinese moon goddess Chang'e, who is frequently depicted wearing a robe adorned in many ribbons, this is likely referenced with Sylveon's feelers.
Sylveon may also be based on Kaltes-Ekwa, a moon goddess in Ugrian mythology who shape-shifted into a hare. In addition, its cries depicted in New Pokémon Snap are similar to that of a cat and might likely be based on the fictional cabbit hybrid.
Sylveon may be a combination of sylph, a mythological creature described as invisible beings of the air, or sylvan, a word referring to an association with woodlands or forests (where fairies are often depicted), and eon (an immeasurably long period of time, possibly referring to how long evolution takes naturally). Eon is a suffix all Eeveeevolutions share and was Eevee's English prototype name.
Nymphia is derived from nymph, a deity existing in Greek Mythology associated with a particular location or landform.