Ultra-sun: The bug is mostly dead, with the mushroom on its back having become the main body. If the mushroom comes off, the bug stops moving.Moon: It scatters toxic spores from its mushroom cap. Once harvested, these spores can be steeped and boiled down to prepare herbal medicines.Alpha-sapphire: Parasect is known to infest large trees en masse and drain nutrients from the lower trunk and roots. When an infested tree dies, they move onto another tree all at once.
Prof. Lotus' Notes: Parasect is a portmanteau of Parasite and Insect. The Cordyceps like fungus that it contracted as a Paras has fully taken over it's body, as can be seen by it's lifeless eyes. This host creature is no longer be seen as alive, and is merely a shell / puppet controlled by the virus. A similar concept can be seen in the video game the 'Last of Us'.