Gatomon X, also known as Gatomon (X Antibody) (テイルモンＸ抗体 Tailmon X kōtai) is a digivolution of Gatomon achieved through the X Antibody, It has a second tail, a bell on it's ear, and red forehead markings. The holy ring it wore on its tail now hangs loosely around its neck.

Gatomon has become shorter, more curious, and more mischievous than ever, and its underlying innocence has become more pronounced. Since this transformation brought out its underlying personality rather than make it better-suited for battle, it’s speculated that the antibody removed extraneous elements from it so it could better wield its latent holy power. The ring of the bell-shaped Holy Chime on Gatomon X's ear gets louder the more holy power the chime is exposed to, and it can drive away evil Digimon.