We'll never know, since Fierce Deity Link is only in Majora's Mask. It certainly sounds like a good idea for a fanfiction, though.
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Zant and Ganondorf share a bodily link, zant was dead at the time but Ganon could revive him - but once Ganon was in Hyrule he didn't need him so he didn't revive him. Once ganon was defeated and about to die, he tried reviving zant so he could bring him back to Hyrule after, but Zant knew Ganon wasn't trying to help him since he could've revived him sooner, so he broke his neck as revenge - breaking ganondorf's neck and their bodily link as well.
Since Shadow Link mirrors pretty much every move you have, the only way to defeat Shadow Link is to use the Megaton Hammer, which is the only weapon that Shadow Link doesn't have.
Beat classic mode with anyone on very easy then defeat jigglypuff, beat classic mode with 13 of the original characters then defeat young link and marth, beat classic mode with marth then defeat roy, beat the first adventure mode stage with a 2 in your seconds For Example: 3:32:99 then defeat luigi and defeat him again at the end of adventure mode, finish the 100 man melee mode then defeat falco, beat the legendary Pokemon event then defeat pichu, beat the triforce gathering event then defeat ganondorf, play in melee mode for 50 hours or 5 hours with 4 human players then defeat mewtwo, beat classic mode with Mario then defeat dr Mario, play 1,000 melees or beat classic mode with mewtwo or finish target test with all 24 characters then defeat mr game and watch.
The only way to get Toon link is to finish Subspace Emissary first. After that, go to the map that link took the master sword. Toon Link is hidden in that map, if you find him, you have to defeat him, after he is defeated, you get Toon Link. I think the easier way than that is to finish any standard level in any one of the characters.(Link, Zelda, Ganondolf) After defeating master hand, Toonlink will show up for battle.
Defeat THE 8 gyms at johto than coms à shady character to give you à key to open it