Good Place to Level Up *minor spoilers*

[Zora]

Update: Well whoever said to go to Centra continent I have to thank for. He accidentally set me to the next dungeon (you are forced into it, it is the Balamb-Galbadia Garden war thingy. You know, Garden Wars).

But anyways, once I get Squall to level 30 (which is one level) that should give me access to the top tier spells monsters have to offer. Which means I have a question. What is the best magic to junction to each stat and what is the best monster to get it from?

Or what is the best way to get it via refining a card. Tell me where to get the card though...

Also, in the time-compressed world, is it possible to go back the normal world?