Quote Originally Posted by The Fonz View Post
If you looking to level up materia, go into the Northern Crater, and look for a room then you'll find pots. Feed them elixir's then kill them for easy materia experience.
Pots and the red bouncing balls as well. =P

And good places to level up would just be the area where you can actually defeat monsters without fear of getting killed yourself. Just sit there holding the x button to fight and run around and hold x again. Its cake.