Sorry for the Double post but I HAVE FOUND SOMETHING OUT! I don't know if you guys already know this or not, just letting you know if you don't.
In WallMarket when you select a materia, at the bottom you'll see a Materia Modifier ONE I repeat ONE I was going through all the stat boosting materia, and they each have a different Number! For example:
HP: Would have an 8 in modifier One
MP: Same thing as HP but with a 9
LCK: Same as the others but with a 5.
Meaning different Effects would have different numbers. You could make LCK plus add an EXP bonus, encounter up, make less encounters etc.
Then all the other Modifiers are for the percentages of how much that stat goes up. Like #2 would have +10% HP, etc. But in Materia Type it must have number 20 for percentages, I have yet to figure out how to do SPECIFIC Numbers.
I'm going to play around with the numbers right now, see what does what. I'll make a list once I know what does what.
Edit: Each materia has a differnt number unless it has the same effect, which it shouldn't. Like all, is number 84, meaning it does whatever ALL does.
Edit 2: THE LIST!!!
Magic Plus: 2
Counter Attack: 83
HP <-> MP: 98