Sorry about taking so long to reply. Here's how:
So have you all seen the dark link in the water temple, well there is another dark link in the game but he is very hard to get. Everyone want to know how to do it. OK. First I want to tell everyone that this is a new dark link that is solid black, not a shiny silver. Anyway, first, you have to start a new game. Then, before you even leave your house you have to read the sign of records. Then walk out and talk to Saria. Continue on through the game until you get all of the spiritual stones. Get the ocarina of time and stand in front of the pedastle of time. Play saria's song on the pedastle of time and then play the song of time and slash it with your sword six times. Then go up to the pedastle of time and drop a bottle of blue fire on it. The Master sword will melt a little (hard to notice even). From now on don't put anything in that bottle or you will have to reset and start over from the beginning. Beat the game as usual but don't do anything at lon lon ranch at all. Don't learn epona's song, don't get the bottles, skulltulas or heart pieces, do absolutly nothing there. When you get to Ganondorf you can not kill him with the master sword for the trick to work. You must kill him with the bottle you put nothing in. Just bounce the fireballs back by hitting them with a bottle. Then hit him with the megaton hammer because you don't have the big gorons sword yet because you need epona. When he is dead go to Ganon and save when he knocks the master sword out of your hands. Reset the game and then go to Lon Lon Ranch. Equip the lens of truth and you will see that the running man is running around the track. He is going very fast so you have to get in the way and press A at the correct time. When you talk to him he will say that he wants to have a real race with you, from the temple of time to the mad scientists lab at Lake Hylia. You have to have the bunny mask from as a kid for this to work. Then when you beat the race, he will give you the dark hood. The dark hood turns you into the dark link. After this go to the temple of time and warp to kid Link. Go to Lon Lon Ranch and put on the dark hood(only at Lon Lon Ranch, not before). Talk to Malon and she will claim you look like an evil fairy boy. Take off the hood and leave Lon Lon Ranch and then go right back in. Talk to Malon and she will say she say one of Ganondorfs men and tells you eponas song in case you see one and need to get away. Leave Lon Lon Ranch and become an adult again. Talk to the running man at the tent in Gerudo Valley and he will claim that he was beaten and wants one more fair race to the bridge. If you can beat him, (very hard) he will give you the longer version of the hookshot called the supershot. Right after you get the supershot use it without moving and supershot to the tree at lon lon ranch. Play eponas song and epona will come to you. Shoot epona with the supershot and she will turn blue like when you shoot a bad guy with the hookshot. When she is like that, play the song of time and she will stay like that. Put on the dark hood and warp to the temple of time. Pull out the master sword and when you become an adult you will still be wearing the dark hood and now you can't take it off, you are dark link. Run to Lon Lon ranch and Epona is still there. Play the song of time and she will turn into a regular horse but she is black and looks like ganondorfs horse. Talk to Ingo and he will say that you are trying to steal ganondorfs horse. You fight him with aroows while on horse back and if you shoot him enough he will quit and tell him that since you look like one of ganondorf's men you can keep the horse. Now you own the horse. HOORAY. It is much faster and you can use all your weapons on it.
Get a Dark Arrow
To do this trick you first have to do the dark/evil link trick above. Then when you have Ganons horse, go to the Gerudo archery game. Play the game and use only light arrows. You have to get over 1500 points for the trick to work. If you win you get the dark arrow that replaces the light arrow. This arrow kills everyone in one shot, including ganon and ganondorf.
Don't ever make me do that again!!!