ChronoCore

The Chrono Core, also called Chrono Data, is the main enemy of Digimon World: Dawn/Dusk. As part of its plot, it takes all of the digi-entelechies of the Digital World, and according to ChaosGallantmon Core/Ophanimon C, this means that "[the] Chrono Data control all digivolution here in the Digital World." When you defeat ExoGrimon in Digimon World Dawn/Dusk he says"if only Chronomon were here"