There's one way of finding it,
you just go into to battle with the female trainer, and save the palette.
VBA>Battle as girl>Tools>Palette viewer>Save OBJ>.pal file(paintshop)
Then search it in APE.(I think compressed.)
There is a number of offsets, but just replace them all with your new palette, I did that since the palette of my backsprite is the same as the palette of my trainercard sprite.
If you find it please post it so I can put it in the thread.