Energystool

The Energystool is a unique sporovid because of the special blue energy pulsing through its body. Unlike most other sporovids, the Energystool cannot possess Pikmin with its spores. It does, however, possess a much more devastating attack: it can spray a deadly blue mist from the underside of its cap, which is a weaponized form of the Aura the creature contains. This mist kills all types of Pikmin on contact, making the Energystool exceedingly dangerous. It is unknown how this creature generates an aura within its body, making it another biological science mystery.

Pikmin
Swarm it with a group of about thirty Pikmin. When it trips, throw Pikmin at its vulnerable and tender stem. Beware the Energystool's mist.

Leaders
Repeatedly punch it until it is defeated. It is a lengthy process but it minimizes Pikmin casualties.