Next to hyrule castle,[right after you get out of the moat]there is a tree. Play the song of storms next to it and a sound will go off. a hole will apear next to the tree. Now, go into the hole and bomb all three walls. In one wall there will be a skulltula and a gold skulltula. Kill the gold skulltula,but right before you get the token with the boomerang [when the skulltula token is on the boomerang] do a backflip back into the portal. You will notice the skulltula saying will be cut off. Anyway, if you go back down and bomb the same wall again, the gold skulltula will be there!Keep on repeating this prosses until you get 100 gold skulltulas total!