SkullGreymon

SkullGreymon is a virus type, dark type ultimate Digimon. His name is derived from Skull and Greymon. It's apearance is just bones and a missle on the top of his back that he can use on opponent Digimon.

Digimon Virtual Pet
It's been rumored that the user can get SkullGreymon but it is very rare. It's a glitch and it's reported to look like a glitched up Greymon.

Digimon World DS
SkullGreymon appears as a unobtainable boss in the Chrome Mine when the player is trying to rescue Phil. At first, he appears as a Machinedramon. Phil tricks him into inserting a chip that degenerates him into SkullGreymon instead of digivolving him. He takes up three spaces in battle and is level 21 with an extremely large health bar

Digimon World Dawn & Dusk
SkullGreymon is #197, and is an Ultimate-level, Attacker-class, Dark species Digimon with a resistance to the Dark element and weakness to the Light element. Its basic stats are 236 HP, 224 MP, 146 Attack, 125 Defense, 71 Spirit, 89 Speed, and 55 Aptitude. It possesses the Powerful 4, Dark Veil, and Antidote 3 traits.

SkullGreymon digivolves from DarkTyrannomon and can digivolve to Machinedramon. In order to digivolve or degenerate to SkullGreymon, your Digimon must be at least level 42, with 7000 Dark experience, and you must have previously befriended a SkullGreymon.

Digimon World Championship
SkullGreymon can digivolve from Ankylomon, Growlmon, Greymon, Tyrannomon, Devidramon, Tortomon and Monochromon by passing time, and can digivolve to SkullMammothmon by passing time. It is found in Sizzling Desert and Chrome Mines.

Attacks

 * Dark Shot (Ground Zero): Launches an organic missile from its spinal cord.
 * Double Dark Shot (グラウンドゼロ改  Ground Zero Kai, lit. "Ground Zero Revision")
 * Curse Breath