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Sceptile is a reptilian, bipedal Pokémon. Its neck is somewhat long, and it has two crests on its head. It has semicircular, yellow eyes with red rims. Its lower jaw and a belt-like band across its waist are also red. Along its back, it has two lines running down the middle and two rows of yellow nodules that are described as seeds. Its tail is shaped similar to that of a palm tree's branch. Both of its long arms have two sharp, elongated leaves and three claws. These leaves allow it to use its former signature move, Leaf Blade.
As Mega Sceptile, its head crests become more pointed and a round portion missing from the middle. Red marking surround its eyes, which become smaller and more narrow. The yellow seeds down its back grow larger. The last pair of seeds turns red, while the pair above it turns orange. Red stripes encircle the base of its tail and run across its lower belly. The leaves on its wrists become more pointed, and the upper ones have red tips and half-circles cut out of the middles. Covering its chest and shoulders are plates of leaves similar to those that form its tail. Mega Sceptile's tail grows longer and develops a red stinger at the tip. Mega Sceptile can cut off a portion of its tail to fire it like a missile at an opponent.
Sceptile is a jungle Pokémon. The seeds contain nutrients, which are said to be able to revitalize trees. It is capable of leaping freely from branch to branch. While it has the ability to slice down thick trees, it is known to care lovingly for the plants in the forest. This Pokémon regulates its body temperature by basking in sunlight.