How the heck do you even find something like that?? o_O
If right next to the image in question/image set does not work, and searching recursively does not work (you have the whole palette there in memory, dump it and search the ROM for it) then you have a few options, assuming you need the palette at all (for various things you might not need it if you have one from an emulator or know what should be what and can work accordingly, for the OP it is necessary unless they want to redo a whole bunch of spritework and hope there is a yellow colour in the palette somewhere to replace the red or green and dodge the colour blind issue).
For basic palette animation (on the GBA I usually point people at the rainbow block of mr driller 2) then search for a partial fragment that remains unchanged. Quite often a basic one will be used and then changed from there, this means if you search using the palette as extracted from memory like most people hacking palettes start with then you will fall short but this will hopefully find something. Same deal for a more complex palette animation but the more animation there is the smaller fragment you have to search with.
For a dynamic palette, like brightness settings, then you can try relative search if you want. The palette you dump with the various brightness settings will still be the same in many cases, just be shifted up or down so much across the board.
I should also say the GBA and SNES share a palette format, some find this useful for the various ports and remakes the GBA has.
For something like this I imagine a quick tracing session was done. You can hopefully find a point in the game before the palette in question is loaded (and with menus and such you might even be able to shuffle it in and out very quickly and reliably compared to some other things people search for). From there do a break on write (bpw) for the given area of palette memory ( http://problemkaputt.de/gbatek.htm#lcdcolorpalettes
) and trigger the palette to be written, hopefully it is a CPU copy or a DMA or something directly from the ROM but otherwise you follow the chain back up to where it comes from the ROM. By mere virtue of following it through you will also know exactly what was done to the palette, if anything, on its way from the ROM to the palette section.
Basic overview of tracing with VBA-sdl-h http://www.romhacking.net/documents/361/
, no$gba is better and the steps you take will probably be launched from a GUI but still be the same concepts underneath.