HG Backsprite corrupt frame on wild battle?

[Elyria]

I am trying to edit player back sprites in HG but there is one frame that for some reason isn't included in a-0-0-6-6_5.RGCN. If I only edit this file the startup frame of wild encounters remains as the base trainer sprite but with the new palette. If I use PokeDSPic I can edit it to be the correct sprite however despite using the correct palette the palette is all in the wrong place.

 

Any ideas how to fix this?

[Elyria]

Okay so I have figured out that the frame is overlayed ontop of the frame animation for some reason. Meaning if I make the hidden frame all background it will just show the normal frame beneath it. Problem is every time I edit one of the PNGs even if I change absolutely nothing and just save it it says must be 8bpp, probably won't work. Google has no idea, has anyone figured this out?