In FF7, what happens if....

you give the man outside Midgar what he is looking for and if you defeat emerald weapon?Educated_Gamer

WOOOOOOOOOOOOOOOOOOOOOOOW! Did you just start playing FFVll for the first time? 

you give the man outside Midgar what he is looking for and if you defeat emerald weapon?Educated_Gamer

And defeating Emerald Weapon nabs you one master magic, one master command, and one master summon materia.

Which...you probably already have a few of if you beat Emerald.  Oh well. :P