The other cheat posted like this is not as effective as this one, although they are similar. First you need the Viral Heart Disease Skill, and the Vaccine skill. You can acquire them by playing Story mode. Now equip them on any character, it doesn't matter. After you have done that, go into the Options menu, and set the fight timer to 30 seconds. Now go into tournament mode, and choose whatever level you want. Advanced is the best choice. When the match starts, just hold the block button, and thats it. The character will try and hurt you, but it won't work; however make sure to move if they do a block break move, or if you get to close to the edge. Soon, time will run out, and you will win.