A simple hack that sets the color palette to TV Mode. There's no need to have a brightened palette if you're playing the game on a screen other than the original Gameboy Advance.
I've also included a patch for LCD 2, if you actually want that.
Like many Gameboy Advance title, the palette of Final Fantasy Tactics Advance was adjusted for bright display on GBA's notoriously dark screen. This makes the game somewhat ugly on later platforms with better displays. Fortunately, Square-Enix had the forethought of a TV Mode that displayed better on more vibrant screens.
Since you probably aren't playing the game on a stock Gameboy Advance anymore, this mod sets the game to TV Mode by default. It also comes with a patch to set LCD Mode 2 as the default if, for whatever reason, you desire that.
It's a simple mod that only changes a single value, so I anticipate that there will be absolutely no bugs. It should also be completely compatible with all other mods of the game.
Final Fantasy Tactics Advance (USA, Australia).gba - NOINTRO
CRC32: 5645E56C
MD5: CD99CDDE3D45554C1B36FBEB8863B7BD
SHA-1: 4AC05441F4DE70A4EC3DD932116346C61B8783D9
SHA-256: 43FC8204C6DCEEE58828AEBC7AF0C72EB807E99F35AD641C8BB0A4FA8B6EDC19