The Summon Materia are Choco/Mog, Shiva, Ifrit, Ramuh, Titan, Odin, Bahamut, Leviathan, Kjata, Alexander, Neo Bahamut, Phoenix, Hades, Bahamut ZERO, Typhon, and Knights of the Round.
Knights of the Round summon from FFVII as it does the most damage any summon will ever do if it's maxed out doing 13x 9999 damage.
the final bahamut summon/materia
Yes, nothing else will do. You cannot reach the island in which it is kept any other way. However you can defeat Emerald Weapon and trade the Earth Harp you receive to a man in Kalm, and he will give you three Master Materia, the summon one will allow you to cast Knights of the Round, though you won't have a separate Knights of the Round materia.
There's only two "Holy" Materia. 1. The Materia Aeris has, as seen in the death cutscene, which is a plot element, and is not used in combat ever. 2. The Alexander summon materia, which can be found on the great glacier. It's the only materia that can deal holy damage in the whole game, and when you pair it with the Elemental Materia you can either do holy damage (On a weapon) or cut in half, nullify, or absorb holy (based on level) (equipped in armor)
FFVII: Spirits within
it goes FFVII crisis core then the orignal FFVII for the ps1 then the FFVII movie
just simply combine an all materia to wat ever materia u want to use on ur party.........or do u mean for everyone to have that same spell? for each materia u master a new one will appear in you're inventory....for example if i have a fire materia an i level it up to its master level a new fire materia will appear sort of as a reward for taking the time to master the materia.....an then once u have ur new materia ucan master that one an repeat the process...i believe this works for every materia an the game ...accept of course for the master magic , master command, master summon wich you can only aquire 1 of each from the man at calm when u give him the desert rose.
watch the chocobos on the first chocobo farmits above the swamp with the giant snakeTalk to the Chocobo nearest you as you enter the Farm and pick the first answer (I think). after doing a little dance it will give you the Choco/Mog Summon Materia.
When in neighbulhighem (Cloud's hometown) if u come out of the hotel and go straight there's a boy, talk to him and he'll tell u about the "Seven Wonders", he'll tell you about the red water in the town, go to the water tower and climb it u'll see that the red water is just color leaking from a piece of materia, that materia is the Pheonix materia
If you mean for the entire FFVII series, then I can be of help! :) For (the original) FFVII: http://en.wikipedia.org/wiki/Final_Fantasy_VII#Plot For FFVII: Advent Children: http://en.wikipedia.org/wiki/Final_Fantasy_VII_Advent_Children#Plot For FFVII: Before Crisis: http://en.wikipedia.org/wiki/Before_Crisis#Plot For FFVII: Crisis Core: http://en.wikipedia.org/wiki/Crisis_Core:_Final_Fantasy_VII#Plot For FFVII: Dirge of Cerberus: http://en.wikipedia.org/wiki/Dirge_of_Cerberus:_Final_Fantasy_VII#Plot Sorry if it's a little confusing~ but hopefully it will help you!
Given the in game explanation of how materia is created, one would assume that all materia are natural. The black and white materia are debatable, as some fans believe that the white materia was created by the Cetra and the origin of the black materia was never specifically stated. There is also a process in Crisis Core in which materia are fused with each other, which could be considered unnatural considering that the fusion is forced.
If you have the giant red materia than all you need to do is talk to it to get zero.