You're not going to get any useful output with the null video backend unless you're using something like cheat engine or Dolphin's debugger to work out what's going on. Even then, if Smash requires any CPU<->GPU communication, it's still not going to work.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
