Bulbmon is an Ultimate Digimon.
In Fusion,they are members of Bagra Army, they first appeared in Mikey's dream. In episode 25, it was employed by Blastmon to battle against the Fusion Fighters and Greymon, but was killed by Shoutmon X4K. They also appeared in the real world at the final battle.
In Adventure:, it was one of Devimon's fortresses, after the main protagonist rescued T.K and escapes, it was killed by Velgemon.