There's a fairly rare chance of getting it from a Rathian when you carve it's tail after cutting it off, probably around 8 - 10%. You MIGHT be able to get it from the rewards also. Rathalos can also drop it too.
This is in High Rank, not Low Rank or Village.
Rath
rath
Fred Rath's birth name is Rath, Frederick William.
Marius Rath was born in 1970.
Ari Rath was born in 1925.
Matthias Rath was born in 1955.
Emmerich Rath was born in 1883.
Emmerich Rath died in 1962.
Musée Rath was created in 1826.
Garib Rath was created in 2005.
Rath House was created in 1907.
Spyros Rath died in 1983.