Go to hyrule castle as a child, and swim thru the moat. when u climb out, there will be a tree there. play the song of storms and a hole will come in the ground. drop inside. blow up the walls, and theres a skulltula there (if u havent got it already). Kill it with your slingshot, and then when the skultula token is there Z target it and throw your boomerang at it, but backflip onto the warp thing that takes u out of the hole before the boomerang comes back at u. You should hear the music that plays when u get a token while u are leaving. when u are out of the hole, play the song of storm again and fall down in the hole again. The spider should still be there. Just keep doing this over and over again to get more skulltulas.