NO monsters in Dungeons
Continuously press the C button to display the control menu and then B to close it, meanwhile holding the D-pad in any direction. If succesful the dungeons will be empty of monsters.
Slow Motion Mode
To activate slow motion mode, pause the game while in the countryside by holding the start + b buttons. Keep the B button pressed at all times and you will move around in slow-mo! (Such a useful cheat)!