Lilligant is a humanoid Pokémon with plant characteristics. It dons a scarlet flower with white-spotted petals upon its head; said flower has golden filaments with red anther, resembling a crown. It possesses dark green, linear leaves under the flower, and light green, linear leaves underneath the darker leaves. One of the light green leaves, on the back of its head, is about as long as its body and resembles hair. Two light green leaves loosely hang down from its head. Its head and abdomen are white and its eyes, which resemble seeds, are a light shade of scarlet. It has dark green, linear leaves for arms, and a golden sepal under its neck. It wears a large, light green, tulip shaped collection of leaves, resembling a dress. There are two long, dark green, linear leaves coming from its back to around the bottom of its "dress". It also possesses another golden, sepal-shaped extension underneath its "dress", resembling feet.
Though Lilligant is popular with celebrities, veteran Trainers and first-rate gardeners alike have struggled to coax the flower on Lilligant's head into blooming. The flowers bloomed by Lilligant in the wild are also said to be the most beautiful despite all these efforts. Once it blooms, it will wilt if Lilligant is then neglected or when it finds a male partner. The flower emits a sweet-smelling aroma, and it is believed to have a relaxing effect on those exposed to the scent. The flower's fragrance differs slightly depending on the soil it was cultivated in. The oil made by Lilligant's flowers has a sublime scent and is very expensive to buy. It is a rare Pokémon that lives in forests. Lilligant is a female-only species with no male counterpart.
In Hisui, Lilligant takes on a drastically different look. Hisuian Lilligant has a thinner build. Its head and body are white, and the latter is covered in light green leaves, with two small slightly darker leaves coming out from either side. On the left side of its head is a six-petaled pink flower with short filaments jutting out from it, and dark green leaves underneath it. The scent released from this flower causes anyone nearby to experience a heartened feeling. Its eyes are light pink and purple. The leaves on its head that resemble hair are much shorter than on Unovan Lilligant. The sepal around its neck is also smaller.
Hisuian Lilligant's arms are green, with its forearms being a lighter green. They are much longer and thinner than those of Unovan Lilligant. It also has long, powerful legs, and they are white with a dark pink gradient at the calves. It is suspected that these legs developed as a result of living in the snowy mountains of Hisui; they allow Hisuian Lilligant to jump very high and gracefully. Its feet are golden and cover part of its legs, and they seem to resemble dance shoes or snow boots.
A special Hisuian Lilligant is worshiped in Hisui due to her being descended from one of the 10 ancient Pokémon who received a blessing from Arceus. In particular, she is one of the Noble Pokémon who resides in Crimson Mirelands.
Lilligant and Whimsicott can be seen as counterparts. They share a base stat total of 480, are part of two-stage evolutionary lines, and evolve using a Sun Stone. Additionally, Lilligant is exclusive to Pokémon White, White 2, Moon, and Ultra Moon, while Whimsicott is exclusive to Pokémon Black, Black 2, Sun, and Ultra Sun.
Lilligant is based on a lily. Atsuko Nishida mentioned in an interview that she came up with Lilligant while looking at lilies in her home. Furthermore, Lilligant's design was intended to give the impression of an "extravagant princess." Its crown and dress may be derived from Western high-class women's fashion during 1750–1775. It could also be based on a ballroom dancer since its lower body resembles a ball gown, and several of the moves that it learns by leveling up contain the word "Dance".