You can go to cheatfreak.com and search any game for any system and you will get your cheats.
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Here is a cheat for gun upgrades in Monster House for PS2. Hold L1 + R1 and hit Square, Triangle, Square, X, Square, Circle, Square, Square.
there is no cheats for war of the monsters. well there is a cheat in Monster Hunter PS2 infact that is my favorite game. but you heve to buy the cheat CD named AR max 200.000
there is cheats but they don't work
the game for the ps2 that has the most cheats is Grand Teft Auto San Andraes
yes there are cheats for this game,sorry i only know the cheats to it for ps2