Ledian resembles a large, mostly red ladybug. It has two black antennae, a black neck and a black spot in the center of its forehead. Its two eyes are large, blue and slanted, reminiscent of the stereotypical alien. Its four arms are like those of its pre-evolved form Ledyba: black stalks with cartoonish white fists at the end. Its two legs are similar to its arms, but end with large red feet. Its back is red in coloration with large black spots, and the undersides of the ladybug-like wing covers are yellow. It has a single pair of clear wings underneath the wing covers.
A female has shorter antennae.
Due to its fists, which are like boxing gloves, Ledian is capable of using Fighting-type moves such as Mach Punch. Ledian is also able to emit ultrasonic cries that have the power to befuddle foes.
Ledian appears nocturnal or crepuscular in activity, sleeping in the daytime inside a big leaf. When the stars flicker in the night sky, Ledian flutters about, scattering a glowing powder. The star patterns on its back grow larger or smaller depending on the number of stars in the night sky.
Because they need starlight to use as energy, Ledian are likely to inhabit places where the night skies are usually clear and the air is clean. They may sleep in forests when it is daytime.
It may be possible, as Ledian uses the light of the stars as energy, that starlight can be considered as its food.
This Pokémon was unavailable prior to Generation I.