Pheromosa is a thin, white, feminine, cockroach-like Pokémon with gold fish shape mane. It has a long antennae that somewhat resemble the whiskers of fish. Its eyes are oval-shaped with purple irises and blue pupils. It has golden pads on its joints and yellow feet that resemble high heels.
Pheromosa is able to twitch its limbs at a speed of an estimated 120 miles per hour. It also produces a pheromone that causes those nearby to become awestruck at its presence.
Pheromosa can be seen as a counterpart to Buzzwole. Both are Bug/Fighting-types, but while Buzzwole is exclusive to Sun and masculine-looking, Pheromosa is exclusive to Moon and feminine-looking.
Pheromosa bears a close resemblance to Lusamine, especially in its shiny form.
It is unknown why Pheromosa can learn Roost, a move used often by Flying or levitating Pokémon.
Pheromosa is most likely based on an insect, specifically a cockroach. It is ironic that this Pokemon is based on a cockroach because they are usually regarded as dirty, ugly insects while Pheromosa is slender, beautiful, and hates anything unclean. It may also be based on a newly-molted roach nymph, which is white in color.
Pheromosa may incorporate "pheromone", "mimosa", a silky tree plant, and the suffix "-a" which is used in Spanish to represent a female.