MH 1 has lots of cheats......infinite ammo for the weapons you're allowed in each chapter, start the chapter with the weapons for that chapter (instead of having to find them all), Invisibility (your opponents can't see you), Silence (your opponents can't hear you), One-Punch Kill, Infinite health, 3 different suits you can put your character in, and something called Heliumus Hunters, which lets you blow up your opponents with one punch or shot.......
MH 2 has shit for cheats.