Ledyba communicate using a fluid that they secrete from where the legs join the body. They are said to convey feelings to others by altering the fluid's scent.
(From Bulbapedia)Ledyba is similar to a red ladybug with a pattern of five black spots on its back. This pattern differs slightly between different Ledyba. Ledyba's carapace and back (when the wing covers are lifted) are yellow, and its eyes are large and round. Ledyba also has six black legs with hands that resemble boxing gloves and two black antennae. A female Ledyba has a shorter antennae than a male Ledyba does. It has a pair of clear wings underneath its wing covers.
Ledyba is a gregarious Pokémon, to such an extent that it will be timid, stricken with doubt, afraid or even unable to move if it is alone. Ledyba secretes an aromatic fluid from where its legs join its body, which it uses to communicate with other Ledyba. Ledyba conveys its feelings to other Ledyba by altering the fluid's scent, smelling sour when angered. It is very sensitive to cold, so during cold weather, many Ledyba gather together to cluster and keep each other warm. Ledyba has been shown to serve a role in pollinating the fruit-producing plants of the Pokémon world, and is usually instructed to do so by means of a special whistle. However, like most Pokémon, it will also able to respond to regular vocal commands. Ledyba builds its nest on leaves in the forest, joining together and using Reflect to protect its home when needed.