(サンダーボールモン（Ｘ抗体） Thunderballmon (X-Antibody))
Thundermon X is a Mutant Digimon and carrier of the X-Antibody. Its electric power has increased, demonstrating its intense shocking power even with just a punch or a kick, and has the strength to make even large Digimon lose their fighting spirit. It is a Mamemon-like Mutant Digimon. It emits electricity from its magnet-like body. Moving quickly, it battles using electricity.
- Thunder Ball: Fires spheres of discharged electricity as much as 10 MV at opponents who are coming to attack it.
- Thunder Bomber: A combo technique composed of an "Anode Punch" and a "Cathode Kick". It causes a gigantic explosion as if it were a bomb of electricity.
- Anode Punch
- Cathode Kick
Thundermon X is an altered version of Thundermon.
- Thunderballmon X-Antibody (サンダーボールモン（Ｘ抗体）)
- Thundermon X