On Disk 1 when you first get the Tiny Bronco, go down to the islands in the bottom right corner of the map.
On the beaches there, you can fight a Landworm and get 200AP and 5000Gil and a lot of Exp from him(he's weak to ice).
On the inland, you can fight Spirals and steal X-Potions from them and Morph them into Guard Sorces.
On the grass you can fight Head Hunters which are worth 3000Exp and 80AP.
This is a great way to level up your characters and materia and get a good defense early on.
If you go to Gongoga and fight around the reactor, you will find an enemy that you can morph into a Power Source.
Hope this helps
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