Leafeon is a quadrupedal mammalian Pokémon that is feline in appearance. It has a short catlike muzzle, brown eyes with slit pupils, and a small black triangular nose. Its coloration is similar to that of a Siamese cat. Its fur is mainly a yellowish cream hue, with brown paws and feet. The body of a Leafeon is slender and limber. Its tail and ears resemble torn and tattered leaves, and the interior part of its ear is brown in color. Besides the leaf-like ears and tail, there are a multitude of smaller leaves growing from their bodies; leaves grow out from the knee joint areas on the forelegs and hind legs, its chest and its back. A larger, curled leaf grows from the middle of its forehead and is the same soft-green color of all the other leaves.
Most of its behavior is unknown. Its Pokemon PlatinumPokédex entry suggests that it is mainly a pacifist an does not like to fight. Leafeon displays catlike behavior, such as licking its paw and using it to groom its ear (seen in one of its Pokemon-Amie animations). Its cry sounds very similar to a cat's meow.
According to the Pokédex, Leafeon employs photosynthesis on top of its animal capabilities, as a result, it is always surrounded by fresh air.
Leafeon has appeared under the ownership of Zoey. It appeared alongside Zoey's Mismagius in a Grand Festival Semi Final contest battle with up against Nando's Kricketune and Lopunny. It is not known if Zoey's Leafeon evolved from an Eevee or not. Not much is known about this Pokémon.
According to the Diamond and Pearl Pokédex, Leafeon and Glaceon's footprints are the same (this may be related to the fact they both evolve under similar conditions, leveling up near a special rock).
Like Espeon, Leafeon has a type-disadvantage against its evolutionary counterpart (Umbreon and Glaceon respectively). The psychic-type Espeon is weak against the dark-type Umbreon and the grass-type Leafeon is weak against the Ice-type Glaceon. Interestingly both Espeon and Leafeon are associated with the sun and moves relating to it, as Espeon is the Sun Pokemon (and learns Morning Sun via leveling up and Sunny Day via TM) and Leafeon uses the sun for photosynthesis (and learn Sunny Day & Synthesis via leveling up and Solar Beam via TM).
Unlike Espeon, Leafeon does gain a type-advantage against one of the evolutions of Eevee, as the Water-type Vaporeon is weak against Leafeon's grass-type.
In addition to Glaceon, the Leafeon has a type disadvantage against the Fire-type Flareon. This makes Leafeon and Vaporeon (as Vaporeon's water-type is also weak against to the Jolteon's Electric-type) the only evolutions of Eevee weak against the types of 2 evolutions of Eevee while they are also strong against at least 1 evolution of Eevee (Leafeon is strong against Vaporeon, while Vaporeon is strong against Flareon (which is strong against Leafeon).
Both Leafeon and its counterpart Glaceon are weak against Flareon.
Like all Eeveelutions, Lefeaon resembles a cat. Its coloration is very similar to that of a Siamese cat, with brown points on its feet. It also strongly resembles the Jungle cat, which has similar cream-colored scruffy fur and lives in densely forested areas.
Leafeon's name is a combination of the words "leaf" (due to its Grass-typing), and "eon" meaning an indefinitely long period of time.