Like its pre-evolution, Gloom has a blue-colored body. However, it now has a reddish-brown, white-spotted "flower" atop its head. The "flower" resembles a rainforest flower, the rafflesia, which is said to smell like rotten meat. The leaves it had as an Oddish seems to be withering underneath the flower. Gloom's eyes seem perpetually closed in appearance, and their purple lips seem to drip drool constantly, however, the 'drool' is actually nectar. Gloom has gained a pair of arms, and its legs seem more developed in form.
A female has fewer, albeit larger, spots on its petals.
Gloom's most well-known special ability is launching horrid-smelling pollen that has been described as smelling like a mixture of old sneakers, garbage, and rotten eggs with a hint of skunk fumes. This stench has shown to smell bad enough to knock out other people and Pokémon. Like many other Grass-types, Gloom can utilize the sun to become faster in sunlight. Gloom is also able to learn powder-based moves like PoisonPowder and Sleep Powder, restore health in moonlight, and perform attacks that drain energy from its opponent like Giga Drain.
The fluid that oozes from its mouth, despite appearance, is actually a honey-like nectar Gloom uses to attract prey. Gloom is characterized of being able to release an incredibly foul stench from the pistils and pollen of its flower. When faced with danger, the stench worsens. If Gloom is feeling calm and secure, however, it does not release its usual stinky aroma. Contrary to appearances, it is quite flamboyant.
Gloom live in grassy plains, and can also be found in tropical areas such as jungles and swamps, where the ground is rich in nutrients. It is commonly found in Kanto and Johto.
Gloom uses a nectar to attract prey.
This Pokémon was unavailable prior to Generation I.