How can you do ALL THAT I cannot even find the knights of round and you can repeat it forever?!! please how in the world are you suppose to do that?
alright, here's where i can shine.
to get the knights of the round materia, you need to obtain a gold chocobo by carefully breeding the right chocobos. the knights of the round summon materia is on a small island, covered by mountains in the upper right hand corner of the world map.
you can link the knights of the round materia with the mp absorb materia, which is obtainable by going to Wutai (sp?) and completing the yuffie quest....or by going into the cat house after the yuffie quest, i can't remember. the amount of damage done by the attack is proportional to the amount of mp you get back, meaning knights of the round will get you ALL of your mp back.
next, have the w-summon materia, which can be obtained in the battle arena at the gold saucer by getting many points. this causes you to use the summon twice.
next, you can get the mime materia by having a chocobo that can climb a mountain (green, black, or gold) and go to a cave near wutai (again sp?). this will allow you to mimic the previous action.
by mastering at least two of the mimes, meaning you have three (which you can easily get ap by tossing elixirs at these purple guys in pots at the northern crater in disk 3).
with 3 ppl with the mime materia, one person uses w-summon, knights of the round (which is linked to the mp absorb). after two knights of the round, the next person uses mime, and the two knights of the round happens again, as long as you keep using the mime command.
therefore, you are invincible, except for emerald weapon who can do 9,999 damage to all of your characters. but then again, that's what final attack linked to phoenix is there for.
therefore, materia wins