Purple Power Parasite

The Purple Power Parasite is a powerasite that latches on another enemy to shroud them in poisonous gas so long as it is attached. Only White Pikmin can be used to attack the Purple Power Parasite's host and the parasite itself. Attacking the parasite enough will cause it to leap off of its host, returning the host to normal, and attempt to flee. It is harmless when alone, making it easy to kill.

Olimar's notes

 * "It is advised to attack it before it latches on an enemy. It injects oxygen and poison. The oxygen and poison escape the host's body, creating a dangerous cloud."

Louie's notes

 * "Inedible. Upon eating, contains traces of oxygen and a chemical that poisons the Pikmin."