Gaioumon

A Dragon Man Digimon that increases its own strength as it wins battle, and is a subspecies of the Greymon-species, which are highly capable as Combat Species Digimon. Discovered within a neglected Oriental computer, there are many parts of its strength which are unmeasured, but it has been confirmed that it possesses an unbelievable combat record from its countless battles. Its uniquely shaped "Kikurin" swords, which it acquired due to its combat experience, leave behind eerie tracks of light, and it is said that anything that comes in contact with those tracks will be cut to pieces.

(Source: Wikimon)