Team of Superman, Doomsday and Mongul verses Darkseid.
Planet size arena starting at opposite ends of planet. No BFR.
Most powerful standard versions of each without any extra tech.
e.g. no Sword of Superman, no Lantern rings, no Anti-Life equation, no boom tubes.
Team Superman will work together harmoniously.
Team gets 10 minutes prep to plan attack.
Darkseid gets 10 minute prep to think about what they might do and his strategy.