The best way to beat the Garuga quest is to start and go straight to area 7. Go behind the big tree, start looking around and you will find special mushrooms. Keep inspecting the area until the message, "There is nothing else here". Sit till time runs out and put away the Garuga stuff. Head to the quest and hit the Garuga in the head a few times; he will die in about 10 hits. If you want to do this again, you will have to get the mushrooms agan or the monster will be at full health.