Dragon Quest IX: Sentinels of the Starry Skies
Mini Medal Rewards
While playing the game you will find numerous items called Mini Medals. In the town of Dourbridge, you can give these to a pirate king who lives there, and he will give you rare items in exchange. After you've given him 80 Mini Medals, he will sell you rare items. But you must use Mini Medals to buy them instead of Gold. 3 Medals: Prayer Ring 5 Medals: Elfin Elixir 8 Medals: Saint's Ashes 10 Medals: Reset Stone 15 Medals: Orihalcum 20 Medals: Pixie Boots
Item Duplication Through Ad-hoc
To do this trick, connect your DQIX to someone else. Give them any items you can, then shut your game off WITHOUT leaving their world. since you never saved after leaving their world, you'll still have the items you traded, and so will they!
Set the DS clock to match your hero's birthday. Then when hunting for loot, the drop rate increases dramatically making it easier to get what you are looking for.
Secret shop in Dourbridge
If you go around to the back of the village shop in Dourbridge, there is a hidden door. Enter it (requires the Ultimate Key), and then you see a flight of stairs. Go down the stairs, and you can get into a secret shop with rare items.