And, again! I managed to change the palette and greyscale sprite for Red in the intro successfully but when I booted up the rom in VBA, the colors were all messed up. Re-extracted the rom from it's zip folder to get a fresh rom, and opened up NSE again..only to find out it's not letting me replace the greyscale sprites in the intro. I suspect it may have to do with how I'm making my custom intro sprites into greyscale versions, but I'm not sure.