Venomoth is a lepidopteraninsectPokémon whose body is varying shades of purple. Its head and thorax are both light purple, and it has bulbous, round, light blue eyes, a small mandible, and a three-point crest on its head. Tucked close to its thorax are three pairs of tiny, whitish legs. Its abdomen is paler with several black, zigzagging stripes encircling it. It has two pairs of pale purple moth-like wings with thin black venation. Its official artwork and variousTCGcards depict the wings as translucent.
Venomoth's wings are covered in dust-like scales that vary in color depending on their toxic capability. Dark scales are poisonous, while lighter scales can cause paralysis. These scales are released when Venomoth flutters its wings and leak out poison once they make contact with the skin. Venomoth lives in dense temperate forests with thick undergrowth and little light. As a nocturnal Pokémon, Venomoth comes out at night to hunt for its favorite prey. It prefers to feed on insects that gather around light sources, and Venomoth is attracted to bright lights itself. As stated in Pokémon Adventures, Venomoth has a short lifespan.
Venomoth and its pre-evolved form are the Pokémon that went the longest without appearing in a regional Pokédex, excluding their appearances in remakes: prior to the release of Pokémon Scarlet and Violet, their last appearance in a regional Pokédex was in Crystal, almost 22 years earlier.