Monochromon

Monochromon is a Champion Level Dinosaur Digimon that resembles a Monoclonius.

Digimon Adventure
The Digi-Destined encountered 2 Monochromon which surrounded them and the 2 clashed until they fell into the ocean. Another Monochromon pulled Etemon's transport while a bunch of them were seen outside of Datamon's Pyramid who got sucked into the vortex of Etemon's Dark Network with the Tyrannomon and Gazimon thanks to Datamon shooting his attack into it.

Digimon 02
A Monochromon was the first Digimon encountered that was under the control of the Digimon Emperor's Dark Rings. He engaged Flamedramon in a fight and was freed from the Dark Ring. Later on, Mexican Digi-Destined Rosa's Gotsumon Digivolved into Monochromon to fight Dokugumon and Minotarumon.

Digimon Tamers
A Monochromon was destroyed by Gorillamon in Henry Wong's computer game.

Digimon X-Evolution
A bunch of Monochromon were seen as a part of Silphymon's rebel group.