Easier than you think
-Custom Fight Now
-Light Heavyweight Character ( Weight class probably doesnt matter but this is how i did it.)
-Settings
-Easy
-Advanced Settings
CPU damage must be set to max and your damage must be default, but every other setting can be changed making it nearly impossible to lose.
-CPU Stamina-Off
-Stamin Cost (You)-None
-CPU Stamina Cost-Max
-CPU Health Recovery-Off
Shouldnt have to worry about the rest of the settings.
I would suggest picking a fighter that has a head kick move (Most likely X+L1 or O+L1)
My fight lasted 15 seconds. One head kick and I knocked the CPU out.
Easy Silver 👍