Go to the lobby and on United States east. Look for someone called Emmott Rules. Battle him. If he is not there look for Leeds Defender. When you are battling one of them press AFDHJ@@67374.kf (all in capitals) and then surrender. Go back to the workshops on buy parts and type JHGYYUGYUHI (all in capitals) and you will have 1,000,000,000 credits (this only works if you are the same ranking class as the one you are battling).