Darkseid is surely one of the Strongest and also the most evil characters DC has ever had. But Batman has once fought and also defeated him.
After his late son’s(Damian Wayne) body was stolen and taken away by Apokolips,Batman Donned the Hellbat and defeated not only Darkseid, but also his army and his son, Kalibak.
This armor was forged together by Justice League and designed and build by Batman, to fight battles beyond his strength limits. This armor’s first ever appearance was in BATMAN AND ROBIN (VOLUME 2) #33