Shadow Pikmin

Shadow pikmin are a type of pikmin found in Pikmin: civil war which are not able to be controlled. They are black with glowing red eyes and seem to be made a gas like substance rather than a physical being.

in game
in the afore mentioned game, shadow pikmin (led by the Shadow queen) have turned pikmin against each other and attempting to kill all other colours. They are able to possess rogue pikmin (and do just this to the entire bulbmin race) as well as travel at lightning speed to ravage pikmin with its claws.

how to kill
The only way to defeat them is to use the elemental power ups. no physical attack will work.