Dolphin, the GameCube and Wii emulator - Forums

Just Use the Generic Widescreen Code and add it as a Gecko Code.

21:9 Gecko Code Pokepark Wii NTSC:
C221CC6C 00000003
3DC03FA8 91C20000
C2620000 EFB300B2
60000000 00000000
040647C0 4E800020
C221CD38 00000003
3DC03FA8 91C20000
C2620000 ED7302F2
ED8A5824 00000000
Enable 16:9 in Wii Aspect Ratio Settings.

21:9 Code Mario Kart Wii NTSC-U:
048B053C 3FAAD000

21:9 Code Mario Kart Wii NTSC-J:
048B3D4C 3FAAD000

21:9 Code Mario Kart Wii NTSC-K:
048A3064 3FAAD000

21:9 Code Mario Kart Wii PAL:
048B4BEC 3FAAD000

Enable 16:9 in Wii Aspect Ratio Settings.

AR Codes Viewtiful Joe NTSC-U

16:9
041F6C78 3FE38E39

21:9 (2560x1080)
041F6C78 4017B426

21:9 (3440x1440)
041F6C78 4018E38E

For all ratios select in Graphics > General Tab > Aspect Ratio: Stretch to Window

21:9 Code Super Mario Galaxy 1 NTSC:
046A4964 40155555
040972AC 60000000

AR Codes Viewtiful Joe 2 NTSC-U

16:9
042C65A0 3FE38E39

21:9 (2560x1080)
042C65A0 4017B426

21:9 (3440x1440)
042C65A0 4018E38E

For all ratios select in Graphics > General Tab > Aspect Ratio: Stretch to Window

21:9 Gecko Code Super Paper Mario NTSC:
C2278628 00000003
3DC03FA8 91C20000
C2620000 ED7302F2
ED8A5824 00000000
C2278548 00000003
3DC03FA8 91C20000
C2620000 EFB300B2
60000000 00000000
Enable 16:9 in Wii Aspect Ratio Settings

Thanks for the Viewtiful Joe codes!

21:9 Gecko Code Need for Speed Underground 2, Most Wanted and Carbon NTSC and PAL:
F6000001 80008180
ED6D02F2 D17D010C
D2000004 00000003
3DC03FE0 91C20000
C1620000 D17D010C
60000000 00000000
E0000000 80008000

Unfortunately the Generic Widescreen Gecko code doesn't work for Colosseum; it crashes at the Nintendo screen, and then Dolphin actually hangs. But while it's hanging, it is at least displaying in 16:9 :P