There are no official cheat codes for Godzilla: Unleashed on Wii. The game was designed without built-in cheat support, and no widely known codes exist in the community.
Homebrew, modchips, or save-file editors can brick your Wii, corrupt saves, or violate terms of service. Use at your own risk.
Enjoy the game as intended—mastering the kaiju brawler mechanics is the most rewarding path.