If you can acquire all of the seven Power Surges. You will receive the "Tyrant" ending, instead of the "Hero" ending, upon completing Story mode.
The Mothership Connection
Play through the single player game as Aliens. When you get to the"Invasion" level destroy the Mothership instead of defeating the enemies. This unlocks the mothership level for purchase in the store.
To open the cheat input area, simply press A and up on the directional pad on the remote at the same time while Story mode is highlighted on the main menu.
Toggle Game Version Number: 787321
Set Day in Story Mode: 0829XX
Add 90000 store points: 031406
Show Monster Moves: 411411
Unlock All: 204935
Do the following to unlock extra monsters.
||How to Unlock
||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.
||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.
||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.
||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.
||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.
||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.
||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.
||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.
||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.
How to unlock 90`s and 1954 Godzilla
To get Godzilla 90`s you have to complete the game with one monster from each faction and then he will be available for purchase at the store for 20,000 points. For Godzilla 1954 you have to unlock all monsters except for Godzilla 1990`s. Then godzilla 1954 will be 100,000 points. If you have Godzilla 90`s before Godzilla 1954 you can't get him.
Thanks to Revolution Readers Austen and Hannah!