At the title screen, hold down L1, L2, R1, R2 until you hear a clucking noise. Now, when you start the game, Casper will start with Ghost Power, Fire Enhance, and Ice Enhance spheres.
Find Lucky the Chicken
In Casper’s house, move in front of the bookcase. Shoot it with normal, fire, fire, ice, normal, fire, and super spirit blasts, in that order. A secret room will be revealed. Inside you’ll find Lucky the Chicken, who will tell you part of a story.