I made this Shimmerscale farming guide to help out players who want to farm the leathers instead of buying them from the Auction House. I traveled around Zuldazar and Kul Tiras to search for places with high density of mobs which I can kill and drop Shimmerscale. Below you will find a list of places I think are the best for farming Shimmerscale.
Kill Scaleclaw Saurolisks around the marked area.
Kill Venomspine Saurolisks around the marked area.
Kill Shallows Saurolisks around the marked area.