Sneak Army

Sneak Army is a black version of Stealth Sneak that must be fought in the 34th and 4th seeds of the Hades Cup. Like Stealth Sneak, Sneak Army is a giant chameleon-like Heartless that's capable of turning invisible.

It does appear in the first Kingdom Hearts, however, it's only given a name and journal entry in Kingdom Hearts: Final Mix.