Never Ending Fight
On the Options screen, choose Control, then highlight the Point option. Next, hold B and set Point to 0. Finally, challenge a friend to a two-player "Vs." battle. Your point globes will be replaced by counters that show how many rounds you've won. To end the game, press Reset.
Unlimited Continues
Here is a tip to get unlimited continues. After losing, the Continue screen will come up with the number of credits shown in the left-hand corner. Hold Up and press A + B + C simultaneously. Release A + B + C, then press them again to gain a credit. This trick can be repeated as often as desired.