Grademon was the leader of the Bagra Army's force to invade the Sword Zone. When Lord Bagra first attempted to conquer the Digital World, He corrupted Grademon into the violet Evil Grademon.
From that point, Grademon serves as the commander of the Sword Zone branch, under Tactimon. He tries to obtain the Sword Zone's Code Crown by becoming the best swordsman in the Zone, but he is defeated by Shoutmon X4, while the Fusion Fighters annihilate the rest of his force. When Mikey Kudo obtains the Sword Zone's Code Crown, the last unclaimed fragment, Grademon is purified along with the other corrupted Digimon from Zones that Mikey controls. Though Grademon initially rejects the purification, he returns to protect Mikey from Tactimon. Grateful that Mikey has allowed him one chance to do good, Grademon sacrifices himself to destroy the Disruptor Tower that sealed all transportation to and from the Sword Zone.
After rescuing the Fusion Fighters United Army, WarGreymon and Examon explain how Lord Bagra corrupted Grademon, among others. Later, with the power of the true Code Crown, Grademon is revived along with all of the other killed Digimon to help defeat the Bagra Army in the final battle. He joins in the largest DigiFuse to become Shoutmon X7F Superior Mode, who defeats MegaDarknessBagramon. After the battle, he returns to the Digital World with the rest of the Digimon.