Pause the game and hold down L1+R2 and type in UP TRIANGLE DOWN X LEFT SQUARE RIGHT O then release L1+R2 and SLOWLY press L1 R1 L2 R2. "PAUSE" should dissapear. Prsee start to resume Play. Then pressL1+R2 to enter the debug Menu. Then select Layout enemy, then add, choose an enemy and assign it to pad 2.select layout enemy again and choose GO. Run far enough away from your previous position so that when you return, the created enemy will have reappeared. This enemy willbe controllable from pad 2.
Pause The Game. Hold L1+R2 And Press Up, Triangle, Down, X, Left, Square, Right, Circle. Release L1+R2, And Slowly Press L1, R1, L2, R2, Wait A Moment And Press Start. Anytime During Gameplay Press L2+R2