Godzilla Unleashed Cheats - Wii

Cheat Mode
At the main menu, press [A], [Up] and then enter one of the following codes:

031406 - 90.000 store points
0829xx - Change Day (xx os the wanted day; ie. 05 for day 5)
411411 - Display monster moves
787321 - Toggle Version Number
204935 - Unlock Everything

Unlock Monsters
Certain monsters are unlocked by completing a required task:

Baragon - Free Baragon from the crystals in "A Friend in Need" at Monster Island as a Alien. Defeat him in the "Baragon" stage and buy him for 15,000 points.
Biollante - Be a Earth Defender and play "Rumble in the Surf" at Tokyo. Destroy the building with vines and defeat Biollante later on and buy her for 30,000 pts.
Krystalak - Play "Terran Mind-Control" at New York as an Alien. Destroy large crystal in crater and nine days later defeat Krystalak and buy him for 20,000 pts.
Mecha-King Ghidorah - Play "Invasion" as a Earth Defender at San Francisco and defeat Ghidorah. Play "M.K.G" and defeat Mecha Ghidorah and buy him for 50,000 points.
Megagurius - Be a ED and play "Enter General Gyozen" at London. Destroy three teal crystals. Return near the end and defeat Megaguirus. Buy her for 20,000 pts.
Obsidius - Play a mech from GDF and play "Big Trouble" at Seattle. Destroy three cone crystals. Defeat Obsidius later and buy him for 20,000 pts.
Varan - Play as an Alien and destory the crystals on the Mothership in "On the Mothership". Return to the level and defeat Varan and buy him for 30,000 pts.
SpaceGodzilla - Play as a Mutant and obtain four Power Surges and beat "Tyrant" at the end of the game. SpaceGodzilla will be added to the shop and will cost 100,000.
Titanosaurus - Use a mech from GDF and play "Soloist" at Sydney. Destroy three circular ice structures. Return later and defeat the dinosaur. Buy him for 25,000 pts.