Great Exp and Gald
Now, this hint is not available to all players. You just have to make sure you already summoned Gnome, the the summon spirit of Earth in Tetthe'alla. Now, go to the Temple of Earth and go to the dragon by going through the secret passage. Fight the dragon, BUT I recommend having Genis, Raine, and two other melee fighters (although I recommend Colette for one of them).
This is easier if you are at least level 60 and Raine has Ray, Genis has cyclone, and Colette has Stardust Cross for best results. Now, I just had Raine, Colette, and -third melee fighter- do whatever they wanted, as I was playing Genis. I had Genis constantly cast Ice tornado, and I fought the dragon three times (get out of the secret passage and go back in to refresh the dragon) to enable Unison Attack. So, for the U attack, have Raine cast Ray, Colette cast Stardust Cross, and Genis cast Cyclone, and whatever with the last person. (Colette doesn't HAVE to use Stardust Cross).
Ray and Cyclone will trigger Prism Stars, and it does a heck a lot of damage. I noticed that you get at least 350 exp with the dragon, and I compared it to the monsters of Latheon Gorge (if you passed it) and the dragon gives more exp, although the dragon gives around 800 exp if you fight it earlier. And you may have noticed that the dragon gives 10,000 gald when you kill it, so when you are constantly killing it, it gives you great exp and gald.
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