How do you get a DarkTyranmon?

To obtain a DarkTyranmon in the Digimon games, you typically need to evolve a Tyranomon. This often requires leveling up your Tyranomon to a certain level and ensuring it meets specific conditions, such as having certain stats or being in a particular moral alignment. In some games, you may also need to trigger specific events or have certain items. Always check the specific game mechanics, as they can vary.