How do you kill the mini boss of the Water Temple in Ocarina of Time?

i think you're talking about dark link. Dark link copies all of your moves. But he has no items. Use the goron hammer to smash dark link. But watch out, everytime you hit him he'll appear behind you....

Somebody just asked that question! now i get to answer it again. You use your heavy boots and wear your blue tunic to go under water at lake hiylia you will see a door under water nd that is where...

Dark Link. To defeat him use either the Megaton Hammer or Din's Fire.

I think the only one you are required to do in a set order is the forest temple but traditionally after the water temple you go to the shadow temple.

after you have the longshot set the water level to the highest it can be then there will be a target where the normal hookshot cant shoot