Taken from wowhead
I have a new method for farming this mount that works for lvl 90 characters in 5.2
It relies on two objects both attained though archaeology and one requiring Lorewalkers rep (very easy to get)
1. Restored Artifact made by solving MoP artefacts
2. the Mantid Artifact Sonic Locator brought from lorewalkers vendor for one of the above items.
The concept is simple but again time consuming, upon acquiring the sonic loctator all dig sites in Pandaria become Mantid ones (from my experience these are all clustered in Dread Wastes and Townlong Steppes) and as such are closely grouped and easy to farm, each completed artefact can be made into a create which will net you 6-9 fragments and the chance of a corresponding token of your choice when traded in. (bonus 3 crates for a pristine item)
This means you can have a steady supply of fragments with out relying on dig site placement and long travel times.
(other items and npcs to reference Crate of Tol'vir Archaeology Fragments & Brann Bronzebeard)