Skullrex location other then crescent island

Where do you find skull Rex looking to forge and plasmarex

the only place i found him is north of rejin i dont know if this is cresent island but if it is well this is the only place i encountered him. after a few goes you should be able to find him. i find his spawn rate uncommon to find.

I beleive the only location thus far with a skullrex spawn is on crescent Isle, north of Reijin. Sorry

He’s a rare encounter in the Ryodou Cave