Instructions
Begin the "Revenge of the Garuga" quest. When you start the quest, take only your weapons and armor and one spiderweb. Head to Area 7 by walking through Area 1 and Area 8. Find a short man in Area 7. When you speak with him, he will offer you a special mushroom for your spiderweb. Accept his offer.
Sit and wait in Area 7 until the quest time runs out. You will receive the message that you have completed the quest. Start the Garuga quest again and go to encounter Garuga. It will have one-third of its normal life bar. Kill Garuga, do the glitch again. Then kill Gagurga to get the Garuga armor and other items.
Start the Desert Gathering quest. Turn off your PSP when the loading screen says "Beginning Quest." Wait 10 seconds, then turn your PSP back on. You will start in a secret desert zone that is between Zone 6 and 7 where you can pick up rare stones from the ground.
Play the game with another player in order to do the duplicate items glitch. Once you collect the items you want to trade, go to the online gathering hall. Give away the items you want to the other player. Turn off your PSP without saving while the other player remains online in the gathering hall. Turn on the PSP, start the game and you will have the items that you gave away.