Press start to pause and enter:
Start a game in Career mode. At the Career Rankings screen, select Training mode, then select Offense. During training, use the following moves to hit the opponent. Press Down and A simultaneously, press Down and A simultaneously, press Down and B simultaneously, press Down and B simultaneously. Repeat this sequence until you have hit your opponent for 30 times.
Select career mode and choose Muhammud Ali. Go to training after every match and repeatedly press C-Up when next to the trainer.