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What is the best place to level up materia I don't buy its northern cave I find midel area more usefull
It is the Northern Crater but only in one specific part of the dungeon. When your party has to split up, take the left path, then you need to take the north path during the second split up I believe, either way its easy to back track to the place. The place has you jumping onto platforms where their is lots of water and the place has weird plant like designs that look like Spider Webs. In this area you fight Magic Pots and the even more rare Mover enemies. Both give tons of AP but Movers are super rare and Magic Pots need Elixers to kill (specifically elixers, MegaElixers don't count) in order to be able to kill them but you have to watch out for all the Master Tonberries who will murder Cloud easily.