Dark Link (Ocarina of Time)
Unlike his predecessors and successors, Link's sword is not the only weapon that can deal damage to Dark Link such as Din's Fire and the Megaton Hammer. Dark Link also has many abilities that Link does not have like him jumping up on Link's sword. With each hit, Dark Link falls through the floor and spring back up afterwards. Interestingly, Dark Link and Link have the same amount of health due to Dark Link having the same amount of Heart Containers Link has at the point, making him harder to defeat if Link has collected more hearts. At the beginning of the battle, Dark Link is nearly transparent, but gradually becomes opaque as Link damages him. As the battle progresses, Dark Link also becomes more aggressive.
There are many ways for Link to defeat Dark Link. Link can use the Deku Nuts to stun Dark Link and attack with the Megaton Hammer or his Sword. Din's Fire is the most powerful item Link can use against Dark Link, so he should stock up on Green Potions. Once Dark Link is defeated, Link is rewarded with the Longshot.