Mephistomon X

Mephistomon X is a Fallen Angel Digimon and carrier of the X-Antibody.

Etymologies
Official romanization given by the Digimon Reference Book and used in Japanese media.
 * Mephismon X-Antibody (メフィスモン (Ｘ抗体))
 * X-Antibody.
 * X-Antibody.

Digital Monster X Ver.2
Mephistomon X is an Ultimate Digimon in the Purple version.