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Ledian is a large, mostly red, ladybug-like Pokémon. It has two black antennae, a black neck, and a black spot in the center of its forehead. A female Ledian's antennae are shorter than those of a male. Its two eyes are large, blue, and slanted. It has four black arms with white hands clenched into fists. Its two legs are similar to its arms, but end with large red feet. Its back is red with large black spots, and the undersides of the elytra are yellow. It has a single pair of clear wings that can be folded underneath the elytra.
Ledian sleeps in forests 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. It uses starlight as energy.