The Legend of Zelda: Ocarina of Time Tips

Dark Link Tactics - Fighting With Spin Attacks
With the master sword, move to just within striking range, and use the spin attack (rotate the control stick, and press B). You may want to practice your spin attack before facing Dark Link, but he has difficulty blocking it.

Never try to stab at dark link. He will jump onto your outstretched blade, dealing a great amount of damage when he strikes you. Don't z-target him either, as it limits your mobility and makes it easier for him to defend against your attacks.