Gregar

Gregar is a Cybeast who was born of the same method that made Gospel, which is why they are so similar in appearance. However, the accumulation of bugs was natural and not man-made.

When he was born, he attacked and destroyed the Net and everything in it. As a solution, scientists invented Falzar to fight it. One day when they were fighting, they got close to the Underground, where they were trapped.

Gregar was released by CircusMan.EXE and went rampant. MegaMan.EXE tried to stop him but he had took over MegaMan.EXE through Beast Out. The first time he did that, he rejected the Healing Water and nearly deleted HeatMan.EXE in one shot. Dr. Hikari says after he takes over MegaMan that whenever he awakens, there is a chance that he may take MegaMan over. Were he to take complete control, even if Yuichiro Hikari did everything he could, he may have no choice but to have MegaMan be deleted forcibly. But he didn't, MegaMan obtained Beast Out. He is later placed in a giant Copybot but is deleted by MegaMan.EXE or Colonel.EXE and Iris.EXE depending on which version of the game you play.