Final Fantasy Crystal Chronicles

Final Fantasy: Crystal Chronicles, Square's first game for a Nintendo console since the days of the SNES, takes the lush fantasy world from the Final Fantasy franchise and adds in hack-and-slash-style four-player action. The game does away with traditional experience points and instead focuses on action-oriented combat with a unique co-op slant. Up to three friends can join in on the quest, by using Game Boy Advance units connected to the GameCube as controllers. While all the main action takes place on the screen, the GBAs enable the players to access menus, organize their spell spheres, and perform upgrades without slowing down the action. The initial release of this game included a GBA Cable to allow players instant access to the game.

Multiplayer Support via VBA
Multiplayer support via Visual Boy Advance connectivity works. But is very slow even with only a single instance of VBA-M connected. Refer.

To set up multiplayer with VBA-M, follow these steps.
 * Download the latest VBA-M svn.
 * Dump your gba_bios.bin, and enable it in VBA-M (Options > Game Boy Advance > Configure > Boot ROM)
 * Enable BIOS File use VBA-M (Options > Game Boy Advance > Use BIOS File)
 * Disable "Pause when inactive" in VBA-M (Emulation)
 * Enable Local Mode (Options > Link > Local Mode)
 * Enable Link at boot (Options > Link > Link at boot)
 * Use the GameCube link type (Options > Link > Type > GameCube)
 * In the Dolphin configuration, go to the "Controllers" section and select "GBA" for the port input
 * Start the game in Dolphin
 * Now load the gba_bios.bin, in the same way you would load a normal gba-game (File > Open)
 * Enable Turbo Mode in VBA (Emulation > Turbo mode), otherwise the game will run at ~8% speed
 * Now just wait until it connects.

16:9 Aspect Ratio Fix
The built-in Widescreen Hack causes clipping/culling issues. The following AR codes work as a replacement. To avoid conflicts, make sure that Widescreen Hack is disabled while using these codes

NTSC
0418542C C3A2C794 04332D74 3FE38E39

PAL
04186548 C3A2C7CC 04333DCC 3FE38E39