[Graphics] Unlinking Unown form palettes

Hi,

I was wondering if anyone could help me figure out or knows how to unlink the palette of unown's other forms from its base A form so that each form would have a different color set. I have succeeded in changing sprites but it seems that no matter how I edit the palette I want for a specific unown form I am trying to replace and repoint successfully, the sprite in-game still uses the same palette that the base unown A form utilizes. Any help would be greatly appreciated.

I forgot to add that I am using Pokémon Ruby US version. I have a bit of experience with hex editing although not too much and would be able to manually enter the data if it is just changing certain bytes and such. I don't know if that is what is needed or if it is harder than that though.