Boltmon

Boltmon (ボルトモン) is an outlaw Digimon, who fought and defeated Rebellimon. Later, Rebellimon fought him again, and defeated him.

Background
He has lived in the wastelands. He was challenged by Rebellimon and easily defeated the latter. Since then, Rebellimon has vowed to kill him, and Rebellimon managed to kill him.