Nether Dragonscales was introduced for the Burning Crusade Expansion as it can only be skinned from the Outlands. The dragons are between level 67 to 70 and require at least skinning level 335 to skin. The best place to farm Nether Dragonscales would be Blade’s Edge Mountains in the Outlands. The Nether Whelp and Lesser Nether Drakes are easy to slay and efficiency.
See below for where to farm Nether Dragonscales in WoW.