My GulusGammamon hasn't evolved for several weeks, despite meeting the requirements. It should evolve into either Canoweissmon (12 Trophies, 3,000 Vital Values, 15 Battles, 70% Win Ratio) or Kimeramon (8 Trophies, 2,000 Vital Values, 10 Battles, 50% Win Ratio)

Mine has 29 trophies, 5000 V, and 27 battles (92% win), which is more than enough for either, but it still hasn't evolved. I was able to get BetelGammamon to evolve without issue previously.

EDIT: I do not have an NFC device that can run the app, these are the stats for Gulus alone, from the VB itself. Besides, if these stats did come from Gammamon, it wouldn't have been possible to evolve into GulusGammamon, which requires less requirements than any other Champion.