Pollutant

The Pollutant is either an object causing, or a malevolent manifestation of it.

=In fanon games=

In Pikmin: The Last Battle
Pollutant serves as the true final boss of Pikmin: The Last Battle, being the last enemy to be fought. It is a strange, spirit-like entity that can generate hazards and obstacles; it is also why the Plasm Wraith is in pain and even more damaged. It caused PNF-404 to fall into ruins and can be considered the overarching antagonist of the Pikmin franchise. Its true origins remain a mystery, but judging by its name, it is somehow the living body of pollution and was therefore somehow created by the long-gone inhabitants of PNF-404.