Also, you can try these codes by Skiller:
-Super Slow Motion: 2066BA28 3E800000
-Slow Motion: 2066BA28 3F000000
-Quicker Game: 2066BA28 3FC00000
-Hyper Mode: 2066BA28 40000000
-Crazy Speed: 2066BA28 40800000
You'll need a Gameshark, Codebreaker or Action Replay Max to enable these codes. Note that they are in raw format and will need conversions using Omniconvert. These are NTSC V1; I don't have NTSC V2, PAL V1 or PAL V2, sorry.