chaosdukemon

Ultimate-level Dark Knight-type Digimon introduced in 2001. A variant of Dukemon that has embraced its Virus instincts and fully lapsed into the Dark Side, it has become the Digital Hazard incarnate and exists in complete opposition to Dukemon. Chaos Dukemon is clad in grey armor with a dark blue cape. Its right hand brandishes the demonic lance Balmung, whereas its left carries the demonic shield Gorgon.

One theory posits it and Megidramon are the same being, and that its horrific aura manifests either as a dark knight or a dark dragon depending on the viewer.

Chaos Dukemon is referred to as ChaosGallantmon in international material.

Common evolutionary throughline
Jyarimon -> Gigimon -> Guilmon -> Black Growmon -> Black Megalo Growmon -> Chaos Dukemon