. . . you have at least two characters who are faster than your opponent. Get within melée range, and hit Return to enter turn-based mode. Hit "A" to make a melée attack with your fastest character. If you then hit Return twice very quickly, your fastest character should be able to attack again before your opponent can get an attack in at all. With 3 faster characters, you can hit "A" twice and get 2 attacks in, and so on. Of course, you can never get all 4 attacks in, because then your opponent must inevitably come to his turn, and if it's a BIG monster, it might well be a case of "Goodnight Vienna!" 
