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Here's how to use the Yellow debug fight menu:
>You can modify your team on the first screen
>Use the A and B buttons to select your pokemon (using index numbers) on the left
>Again use A and B to select the levels of the mons on the right
>Press Start to confirm your team
>The second screen decides who you'll fight
>The jBg option seems to be for wild battles
>The q-f- option seems to be for trainer battles
>For the q-f option, the left modifies the trainer class, while the right seems to modify the trainer's teams
You'll see a Juerry class while scrolling through the trainer classes but I think that's just the rival's name.
Fun fact, if you try to put a super high number on the right at the trainer menu (e.g choosing Lance and the number 94) you get a glitched team.