Does it matter? The post itself specifies O3DS.
If you don't have Ironfall, then you can't get it anyway, and Smashhax is only for N3DS.
The absolute best would be Cubic Ninja, if you can find it at a price you can afford. Otherwise, Ocarina of Time 3D is the only other option, but that requires you to have access to another homebrew-enabled 3DS to install the exploit, or you can use a Powersaves or an R4i Save Dongle. Alternatively, a DS/Lite with a DS flashcard can also be used to install the save file, but that would require you to cut off the tab on the side of your OoT3D cartridge which is a shame.
(I heard an Action Replay DSi could also be used, on any 3/DS system, provided your ARDSi isn't blocked by your console. It apparently supports .nds homebrew so you would be able to run the DS save manager to upload the oot3dhax save file to an OoT3D cartridge without having to cut off the tab on the side.)