Destromon

Destromon is a Digimon whose name and design are derived from   , Destromon resembles an enormous, red, robotic dinosaur-like creature. This Digimon is armed with an enormous number of energy cannons on its wrists and shoulders; its main weapon is located on its chest. It is the result of the fusion between Vemmon with an experimental battleship known as "Juggernaut".

Digimon World 3
Destromon was the presumed masterpiece of the A.o.A organization, it was first mentioned by the A.o.A Chief in Zhu Que City who informed Junior that they planned to unleash a powerful weapon; the Juggernaut from an undersea base located in the real world known as Magasta. Eventually, Junior ventured there to stop it but he was too late.

The Juggernaut was forced into battle with a naval fleet, its' armor proved to be impenetrable, it was then that the A.o.A made use of Vemmon and used his special ability to fuse himself with the Juggernaut, thus forming Destromon which is far more powerful than the Juggernaut itself, equipped with laser weapons and a giant energy cannon on its' chest; Destromon decimated the attacking fleet with ease and proceeded to attack Kusanagi City.

Realizing that they were unable to fight Destromon as it was already operating in the Real World; Junior and the rest of the game's protagonists managed to find a way to shut it down and eventually destroy it. After defeating the four A.o.A chiefs located in each city on Amaterasu Server, Junior led the attack on Amaterasu City and defeated the president of MAGAMI who became quite submissive following his defeat and informed the protagonists that Destromon could be shut down by the computer that he was guarding, Teddy proceeded to the computer and was successful in shutting down the mechanical monstrosity just as it was about to launch its' laser cannon and annihilate the city.

It is impossible to fight Destromon in the game, as it only appears in cutscenes.

Destromon also makes a slight appearance at the opening cutscene of the game where a Gallantmon and a Beelzemon could be seen battling with each other and they stop as they see Destromon approaching them.