Treasure boxes is the most common way. Or you can find some laying around on the ground in special cases. Sometimes they are rewarded for a complete mission.
You can also buy materia from different shops around the world. Certain materia only appear at some shops and not others, so it's important that you try to at least look at the wares in every store as you come across it during gameplay.
To get the underwater materia, Make sure you have "Morph" materia equipped at a high level. Then, remember the underwater reactor? Well, when you run around outside of the door, it's possible to run into a giant pirate ship with a live skeleton figurehead swinging an oar around. If your "Morph" is strong enough, you should be able to morph him and get the underwater materia!
You need to get the Leviathan Scales from the underwater reactor before the big submarine chase. Then you need to go the the Da Cho mountains in Wutai. Use the Leviathan Scales to put out the fire in the cave, and you'll get the steal as well materia along with a weapon for Yuffie <3 (Answers in Strat guide)
coral reactor....u have to stop he train from crashing,...forget what the place is called but it has a huge bird sitting at top,,,u need to fight off shinra troops there, last one is in junion at the submarine base at the bottom...u will be engage in a submarine battle u need to shoot down the sub before the time runs out...an the last one u get from disarming the rocket heading for meteor after visiting rockettown once all 3 of the other huge materia have been collected.
no, materia is exclusive to the compilation of final fantasy 7 and does not appear anywhere else
You have to level up a 2 cut materia
Counter Attack Materia (Independent/Purple), Is found after you beat the boss 'Materia Keeper'. Found in the Nibelheim Mountains, the materia is mastered after 100000 AP.
Enter Circle, Square, X, X while in the rocket.
It is a piece of armour with 8 unlinked slots and Normal materia growth.
Underwater materia is acquired by morphing an enemy named 'Ghost Ship' in the Junon Underwater Reactor. Doing so gives you an item called 'Guide Book', then exchange this with the man at Kalm for the Underwater materia.
Final Fantasy 7 is written as Final Fantasy VII.
You get the dress from the boutique, and a wig at the gym, cologne at the diner, a tiara at the materia store and underwear at the Honey Bee Inn.
Final Fantasy 7: Advent Children Final Fantasy: The Spirits Within Final Fantasy 7:dierge of ceberus
Final Fantasy 7 is for the PS1, but Final Fantasy 7 Crisis Core is for the PSP and is a prequel to FF 7.
Final Fantasy X-7? no. there is Final Fantasy 10-2 which is the sequel to Final Fantasy 10 (and is the only actual sequel in all of the final fantasy games) and there is Final Fantasy 7, but there is no Final Fantasy x-7. the games may be made by the same people but do not relate to each other in anyway other then the fact they are Final Fantasy.
There are three movies, Final Fantasy spirit within, Final Fantasy 7 Advent Children, and Final Fantasy 7 Last Order