Is there any way to get easy money or exp in dragon quest VIII?

Answer 1

Yes, to get easy EXP fight metal slimes and king metal slimes. They very large amounts of EXP and make leveling up only one or two battles. I used it to level up, you can find them where you can get Yangus ultimate axe.

Money-fight jewelbags (or any of their variations), they give out decent amounts of gold.