Player 1 invulnerable:
 8018720C 0090

Player 2 invulnerable:
 801874D4 0090

Player 1 power level 1:
 8018727E 0030

Player 1 power level 3:
 8018727E 0090

Player 1 power level 0:
 8018727E 0000

Player 2 power level 1:
 80187546 0030

Player 2 power level 3:
 80187546 0090

Player 2 power level 0:
 80187546 0000

Player 1 mid-air special and super moves:
 801871F2 0000

Player 2 mid-air special and super moves:
 801874BA 0000

Infinite Time:
 80194394 6300

Infinite Time to select fighter:
 801E0B98 0000

Player 1 invisible (Note 1):
 801B3824 0000

Player 2 invisible (Note 1):
 801B3318 0000

Note: This game apparently has two versions available. Try the next set if the above won't work.

Note 1: To get the invisible codes to work, the other character must score a hit on you to activate
it. I.e., for the player 1 invisible code to work, player 2 must score a hit to switch it on.