Trading Sequence

First of all, get a Pocket Cucco from the Cucco lady in Kakariko Village, use it to wake Talon up, then take it back to the lady and get Cojiro. Take Cojiro to the Lost Woods and wake up the Carpenter Boss's son with him. Take the Odd Mushroom back to Kakariko Village and go to the Potion shop that is behind the Hyrule Market Potion shop. After she makes the potion, take it back to the guy. When you get there, you'll notice he's gone, so talk to the Kokiri girl. She'll trade you the potion for a Poacher's Saw. Then, take the Saw to the Carpenter in Gerudo Valley and he'll give you his broken Goron's Sword. After you do that, go see the Biggoron on top of Death Mountain. Go talk to him and he'll talk about his eyes hurting. He'll give you a prescription for some eye drops. Then, take the prescription to King Zora, but you'll have to unfreeze him with some Blue Fire. Show him the prescription and he'll give you a eyeball frog. Take the frog to the Lakeside Laboratory and show it to the scientist. He'll ramble on and on, but finally get the idea that it's for eye drops and not food. After you get the eye drops, go see the Biggoron again, but don't warp inside Death Mountain Crater because the eye drops will spoil. Give him the eye drops and then show him the Carpenter's broken Goron sword. The Biggoron then promises you that he will repair the sword for you. You have to wait for 3 days and 3 nights to pass and then he'll give you the finished sword.