Use Crytaltile2 for Lux-Pain specific
open the rom in ct2, get the file system window up (ctrl-N), click on a .ntfx file,
change in the properties pane width to 256 height to 192(or 185 unh), tile form to gba 8bpp
I'm using in the palette tab the gray division, back to properties, change the scale if you want (displays more), select the tile you wish to import or export then goto edit and do so - remebering to save it as you need it (bmp jpg whatever) if you don't like the palette play the game in an emulator and savea sceen shot... then imort the palette from that screenshot any more questions just post again