I used these codes and they froze my wii, when it was at the loading screen after the lobby started.
Round Toggler (Host Only) 9999[PoptartHunter]
28200FA0 00008000
05363F94 39393939
E0000000 80008000
Infinite Ammo & money [Bully@Wiiplaza]1&2
28200FA0 00000300
F23A732C FE80C801
38A00000 00000000
E0000000 00000000
28200FA0 00000300
F266DAD4 02903302
3C007FFF 900300A4
60000000 00000000
E0000000 80008000
Infinite Health/God Mode B -
28200FA0 00001400
F2550690 02537B02
38000801 9003019C
60000000 00000000
E0000000 80008000
Force Host
201D6324 FFFFFFFA
F2691DA0 027C0401
38000000 00000000
Gravity Modifier [Bully@Wiiplaza]
28200FA0 00000300
F24BF5AC 02FC1E02
3D804345 91840018
C0040018 00000000
Speed x2
28200FA0 00000C00
F2386540 02EFCD02
3D804040 91840018
C0040018 00000000
Backwards Speed x2
28200FA0 00001400
F2386460 02EC3302
3D804000 91840018
C0040018 00000000
No Fall Damge
201D6324 FFFFFFFA
F238845C 02EC5F02
3D804CBE 91830018
C0430018 00000000
F23D2188 02C03C01
C0030014 00000000
201D6324 FFFFFFA
Name Modifier [Bully@Wiiplaza]
F266DA30 02805708
3D808100 618C0500
38630050 39600000
39400000 2C0B0007
41820018 7C8A602E
7C8A192E 396B0001
394A0004 4BFFFFE8
3863FFB0 80830050
60000000 00000000
07000500 0000001C
53686172 6B793132
34277320 4C6F6262
79000000 00000000
00000000 00000000
Round Toggler (Host Only) 9999[PoptartHunter]
28200FA0 00008000
05363F94 39393939
E0000000 80008000
Infinite Ammo & money [Bully@Wiiplaza]1&2
28200FA0 00000300
F23A732C FE80C801
38A00000 00000000
E0000000 00000000
28200FA0 00000300
F266DAD4 02903302
3C007FFF 900300A4
60000000 00000000
E0000000 80008000
Infinite Health/God Mode B -
28200FA0 00001400
F2550690 02537B02
38000801 9003019C
60000000 00000000
E0000000 80008000
Force Host
201D6324 FFFFFFFA
F2691DA0 027C0401
38000000 00000000
Gravity Modifier [Bully@Wiiplaza]
28200FA0 00000300
F24BF5AC 02FC1E02
3D804345 91840018
C0040018 00000000
Speed x2
28200FA0 00000C00
F2386540 02EFCD02
3D804040 91840018
C0040018 00000000
Backwards Speed x2
28200FA0 00001400
F2386460 02EC3302
3D804000 91840018
C0040018 00000000
No Fall Damge
201D6324 FFFFFFFA
F238845C 02EC5F02
3D804CBE 91830018
C0430018 00000000
F23D2188 02C03C01
C0030014 00000000
201D6324 FFFFFFA
Name Modifier [Bully@Wiiplaza]
F266DA30 02805708
3D808100 618C0500
38630050 39600000
39400000 2C0B0007
41820018 7C8A602E
7C8A192E 396B0001
394A0004 4BFFFFE8
3863FFB0 80830050
60000000 00000000
07000500 0000001C
53686172 6B793132
34277320 4C6F6262
79000000 00000000
00000000 00000000