To enable cheat mode, at the main menu highlight "Versus" mode, then hold L + B + R, then release B, R, L in that order to display the cheat entry screen. Now you can enter one of the following codes to activate the corresponding effect:
All cites: 480148
All monsters: 696924
Play as Destroyah: 537084 Play as Gigan: 616233
Play as Godzilla 2000: 225133
Play as King Ghidorah: 877467
Play as Mecha Godzilla: 131008
Play as Mecha King Ghidorah: 557456
Play as Orga: 202412
Play as Rodan: 104332
Eleven continues: 760611
Indestructible buildings: 112122
All buildings and objects are throwable: 756287
Health regenerates: 492877
Toggle military: 256806
Technicolor mode: 661334
Black and white mode: 567980
Player indicators always on: 135984
Disable life and energy display: 443253
No health power-ups: 562142
No Mothra power-ups: 134615
No energy power-ups: 413403
No rage power-ups: 119702
No freeze tanks: 841720
View credits: 176542
View version number: 097401