When it senses danger, it shakes its body and scatters toxic spores from the top of its head. These spores can make trees and weeds wilt and cause whole body pain if inhaled. Shroomish lives in forests that are damp. During the day, it hides under fallen leaves in the shade. It eats composted soil in forests, which is made up of fallen, rotten leaves.
Shroomish is a small Pokémon similar to a mushroom. It has beady black eyes and a half-triangle-shaped mouth. Its upper body is beige with frilled segments along the bottom and a small opening at the top. There are green spots marking its upper body, while its lower body is completely green. It has small, round feet and no visible arms or hands.