It’s up to you to choose which weapon works best for you.
Some combination are: Knights of the round linked with w summons and mime. If you equip your other characters with mime you can cast knights of the round several times. There is also sneak attack linked with death blow and mega all. You get first hit and it’s deathblow to all enemies. That’s just alittle to help. I’m sure more people have better combinations and more advice.:)
Also Knights of the Round linked with MP Turbo is a good one.
Of course Final Attack linked with Pheonix.
And last but not least, Bahamut ZERO linked witha Mastered Quadra Magic .
(Actually to have all these materias mastered would be a great help to your cause)
COMBINATION: some good ones were already said, KOTR plus mp-absorb workd great it restores your mp as soon as you cast KOTR, thats about it
GROWTH: clouds apocalypse=triple growth
cids scimitar=triple growth
i belive rune bangle=double growth(get at bone village)
those are the best materia growth items, everyone has a weapon that has double but only cloud and cid have triple(i think there’s one more triple growth weapon but can’t remember)
TIP: its better you find the comination that works best for your style and preferance, like me, i’m a defensive+offensive player, i make sure everyone can heal, but i keep one or two that can deal damage, and have one that can cast status enhancement magic like haste, find your style and experiment, because thats only half the fun of it isn’t it?;)
Cloud: You wouldn’t understand.
Barret: So this is what makes them guys in SOLDIER so great, huh!? Okay, I’ll ask Jessie again later. But you’re in charge of the materia!