Can you only make one Master Materia of each?

I have two sets of all three, one set I made, the other set from beating Emerald. I tried to make another set today and it wouldnt let me. Is there something I have to do or what?

anyone??

You can get as many as you wish... just level up another distict set of the relevant materia and head off to Cosmo Canyon again. If you've tried it and it hasn't worked, you've likely missed some Materia to level up.

You should try Google or Gamefaqs. They are two great sources for information, and you can get answers anytime you wish instead of making a thread about it and freaking out half a day later when not a single person has responded yet.

You should try Google or Gamefaqs. They are two great sources for information, and you can get answers anytime you wish instead of making a thread about it and freaking out half a day later when not a single person has responded yet.
Ok god sorry.... No wonder I dont come to this forum that much. No one cares enough to have some fuckin courtesy. Ill try again.. maybe I did miss some or something...

There's a guide on the main FFS site.