Har har. I scoff at these pathetic newb combos. (Just kidding, don't flame me.)

Let me fish out my FF7 strategy guide. (Once again, please don't flame me.)

Top 5 absolute needed Materia in Final Fantasy 7.

1. Knights of the Round
This is a given. This is an absolute need to destroy any boss and WEAPON in FF. Coupled with W-summon and select other combinations, you will surely make your boss fights much easier. (119,988 points of damage if your INT is high enough.)

2.X Summon/Quad Magic
239,976 points of damage in one turn, coupled with KotR. Need I say more? 479,952 points of damage with Quad magic.

3.Mime
Allows your party member to copy the last action. So, if they have a lot of int, 359,964 points of damage! Oh my god! What happens if your last party member also has mime!? 479,952 points of damage! OMFG! And Quad magic? 719,928!!!!

4.Final Attack
When you die, you get to do something. Obviously this would be coupled with Revive.

5.Either Quad-Magic + Ultima or Mega All + Shield.
If you have someone with int, Quad will do 1/3 damage of KotR. Or, you can focus on the defensive and get Shield... from the final dungeon.

Now some killer combinations.

Sneak Attack - Knights of the Round
Begin the fight by casting KotR. Mime em' to hell. (Less effective, as you cannot couple this with W Summon or Mime)

Cover, Counter Attack, Counter Attack, [Command] Counter-Deathblow
Cover for other characters and immediately counters three times, finishing with Deathblow. Not as effective as causing damage as the other alternatives, but still nice.

Pre-emptive, Sneak Attack - KotR, HP<-->MP
Get the first strike and cast KotR. Characters that have the HP<-->MP materia will be able to continually cast with no rest.

Enjoy.

(Note: This just in! Other party members can mime W Summon, making them cast 2 times as well! But Quad magic cannot be mimed. And no, you cannot manipulate the materia to junction W Summon AND Quad to cast KotR eight times in a row.)

Boy, let me tell you, after seeing all those KotR animations, it gets preeety repetitive. But you can find that out for yourself