Go to Suhulla desert once all of your party members are above level 30. You should be able to defeat the Tornado lizards in one turn with the 'attack' option.
You will get 620 EXP. and around 300 coins per tornado lizard.
Also,defeat the Tempest lizard and Storm lizard (although you can only defeat the Storm lizard once) to get even more EXP. and coins.
Leave the desert to reset the monsters. Use douse in the sandstorms to battle the monsters.
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