This Lustrous Scaled Hide farming guide will show you the places where I farm Lustrous Scaled Hide in Dragonflight.
Lustrous Scaled Hide is dropped by every mob that can drop Adamant Scales, but it has a lot lower drop rate.
Lustrous Scaled Hide
The Waking Shores
The Primal Proto-Drakes at The Waking Shores have really fast respawn rate. Also, a lot of people are questing there, so you often can skin the mobs without killing anything.
There are all kinds of beasts in Thaldraszus at the Shifting Sands. The majority of them drop scales, but you will also get a few Resilient Leather.