BlackGreymon

BlackGreymon is a viral Greymon, more blue than actually black.

Digimon D-Project
A bluish virus version of Greymon can be seen on the Digimon Dictionary.

Digimon World Data Squad
Greymon (Virus) is an unlockable digivolution.

Digimon Rumble Arena 2
BlackGreymon is the digivolution of BlackAgumon, and can warp digivolve into BlackWarGreymon.

Attacks  Variations / Subspecies 
 * Mega Flame
 * Great Antler
 * Greymon