Gon and Dr. B (Another Method)
If you can't beat ball mode or force mode or just don't have the time, here is an easy way to get them. Set the game on easy and one round and infinite time. Play the arcade mode and or the forth, fifth, sixth, and seventh round let the enemy take all but 5 percent of your health then kill him. If you did it right you will here the anouncer say "great" on the next round you will fight Gon or Dr. B. Kill them by using sweeps or anything else and they are yours.
Added by: Tekken Mania Sep 24th 2009, ID#15607