PRE-BATTLE MUG

[eMMe97]

In the first routine the checks doesn't work. If the third byte is not 0x0, it will not "pretend" to be champion class and load as if it was a champion battle.
I know a little about asm and have tried this change to your routine

.thumb
.align 2

main:
ldrb r5, [r4, #0x3]
lsl r5, r5, #0x18
lsr r5, r5, #0x18
cmp r5, #0x0
bne normale
mov r1, #0x28
mov r3, r1
mul r3, r2, r3
ldr r2, =(0x800fc00)
ldr r5, =(0x09b4c18c+1)
bx r5

normale:
ldr r5, =(0x9b4c1f0+1)
bx r5

.align 2

With this modification the function works perfectly.

[SWHSmash]

Can't confirm this now, but when this works flawless, maybe you can also create a pull request for this issue. :)