Fan:Blackmon

This black dinosaur digimon was created by Gabumon, to paralel the technology that they'd created by inventing the digital world,

"See, when we created the digital world, it existed as a world, so, for all time, and that means, back in time, the digital world spread, so new technologies were created in old universes, namely in this case, the dino riders, and this digimon was designed to bring the ancient digital world into synch with the modern one, by introducing the monochromon protocols created by Monochromon himself, back before he was called Gabumon, and was created on a keychain as the first ever living digimon, so forthe he created the digital world and adapted a new digital avatar...

Blackmon resembles a steggosaurus, but all black, save his white and black eyes, this coloring, and white teeth he likes to smile at you with, and his highest steg comes up to a child's waist

this digimon first appears in Digimon Legacies