Your Digimon partner must be a virus digimon. Examples of Virus Digimons are: Betamon, Devimon, Numemon, MetalGreymon, Kabuterimon, Vegiemon, SkullGreymon, Vademon, Kunemon, Ogremon, Bakemon, Sukamon, Etemon, Kuwagamon, Nanimon, or MegaDramon. Any other Digimon will not be allowed to enter.