Go to Single Player Mode and select the Soul Arena mission 'Scorer' with Voldo. If you didn't cheat and unlock everything at once, you'll need to find a steady source of money.
Finish the mission in under 50 seconds (really easy this way) and BOOOM - you get $40,000.
Time it right, and you can push Taki out of the ring roughly, 4 seconds a round. Do nothing but Asteroth's forward, forward B attack. Go to the Soul Arena and pick Asteroth and his Greal Maul weapon (doesn't have to be, but it helps) and enter the Turntable mission on hard mode. Here's another method to make money (without a cheat device). If you can land this a few times (from where you start) it will ring out your apponent instantly! You can also press TOWARDS, (hold) TOWARDS, TRIANGLE and it does the same thing. If you didn't know when you charge at an opponent with Cervantes and press TRIANGLE you stab your apponent and throw them forward.
You can punch them in this state and send them flying. This is easiest to do when they’re midair after being hit. This is fairly obvious, but for an easy (and cheap) KO, get your opponent to the edge of the ring and try to fling them out.
