Gallantmon

Gallantmon is a fictional character in the Digimon series. He is the Mega form of Guilmon and one of the 13 Royal Knights. He is known as Dukemon in the Original Japanese version. His weapons are his Gram Lance and Aegis Shield which he uses to generate his attacks.

Digimon Tamers
The first Biomerged Digimon, Guilmon became Gallantmon when Takato biomerged with him so they could fight Beelzemon together. The ensuing battle was fierce, but Gallantmon managed to defeat Beelzemon. However, Gallantmon did spare the hostile Digimon on Juri's pleas. Gallantmon eventally was a major power in the battle against the D-Reaper, playing a key role in confronting it, obtaining the ARMS "Grani" as his mode of transportation until it gave Gallantmon the power to transform into Gallantmon Crimson Mode for the final battle against D-Reaper.

Digimon Tamers: Runaway Digimon Express
After a Parasimon captures Ruki, Takato and Guilmon Biomerged to save her. They are able to save Ruki but find out that the Parasimon that controled Locomon was trying to get other Parasimon to materialize in the real world. After Jenrya & Ruki Biomerge with their Digimon to stop them, but even after Justimon arrived to help they were greatly outnumbered. In the end Takato refused to give up & enabled Gallantmon to power-up to Crimson Mode, who then used his Final Justice attack to seal the hole the Parasimon used causing all of the Parasimon to die.

Digimon X-Evolution
He is a member of the Royal Knights, but because he questions the intentions of the host computer Yggdrasil, he acts individually. He tried to convince his close friend Omnimon that they were being used and that their Lord Yggdrasil's Project Ark was more than it seemed, but Omnimon refused to hear it. The two Knights engaged in a brief battle in which Gallantmon was killed as a result; from his final words, it seems like his impalement on Omnimon's blade was intentional. However, Gallantmon was soon reborn into Gallantmon X form, and gave DORUgremon safe passage to Yggdrasil while joining the battle with other Digimon against an endless swarm of Death-X Dorugremon.