All the upgrades you can get GameCube

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                                 UPGRADES
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|Slingshot upgrades|
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-Go to the lost woods and go to the right, you will see a tree with a ‘target’ 
hanging from the branch, shoot the target in the middle three times (get three 
bulls eyes) make sure that 100 comes out three times in a row and a Deku will 
come out of the tree and give you the upgrade
(Young Link)

-Go to Hyrule market and go to the store with a target mark above it, play the 
mini-game and win it, the guy will give you the upgrade.
(Young link)

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|Deku nut upgrades|
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-To get the deku nut upgrades bring the mask of truth to the crowd of deku 
scrubs in the lost woods and they will give you the upgrade. The directions to 
get there is from the entrance of lost woods, right, left, right, left, left. 
Look for the butterflies and walk around near them to find a hole. The deku 
crowd is in the hole.
(Young link)

-Go to the lost woods and go to the sacred forest meadow’s entrance but don’t 
enter it. Go back a little bit until you get to a big boulder. Blow this 
boulder up with a bomb and go into the hole that it uncovers Make the deku 
talk to you and he will sell you the upgrade
(Young/Adult Link)

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|Fairy Bow Upgrades|
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-Go to Kakariko village and look for a red house with a target on it, it is in 
the middle of town. Go in it and play the mini-game (just like the slingshot 
mini-game).
(Adult Link)

-Go to Gerudo’s fortress with epona and go behind the fortress itself to find 
a range with some targets. Talk to the man while on epona to start the mini-
game. Get 1500+ points and you will get the upgrade
(Adult Link)

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|Deku stick upgrades| 
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-This is in the same place as deku nut upgrade #1. This time talk to them with 
the skull mask on.
(Young Link)

-Again this one is found in the lost woods. Go left twice and go to the bottom 
level and find a business deku and he will sell the upgrade to you.
(Young Link)

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|Bomb Bag upgrades|
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-Go to Goron city and go to the floor with a goron rolling all over. Stop him 
with a bomb in the tunnel. He will give you the upgrade only if you stopped 
him in the tunnel.
(Young/Adult Link)

-In the Hyrule market, go to the bombchu bowling game at nighttime and win the 
game if you are lucky you will win the upgrade.
(Young/Adult link)