Omnimon X

Omnimon X is an Omnimon modified with the X Program.

Digimon X-Evolution
He is the confident leader of the Royal Knights, initially carrying out Project Ark almost to the letter. He is a follower of the word of Yggdrasil, a super-computer governing the current Digital World. In X-Evolution, he is the main policing power, although he acts against informants and those betrayed with unprejudiced force. When Gallantmon confronted him about Yggdrasil, they were unable to agree about the nature of Project Ark and so they fought, ending with the other Knight's demise. This event is what makes Omnimon seriously start to question Yggdrasil, shaken as he is by his friend's death. But even so, he still carries out Yggdrasil's orders.

It was only when Alphamon saved Omnimon's life, and gave him a X-Antibody in the process, the the Knight's eyes were really opened to Yggdrasil's true motives. X-digivolving into Omnimon X, he destroyed Yggdrasil with All Delete, resetting the Digital World as a result.