I've only faced this monster twice thus far, and I was lucky enough to get the Robe on my 2nd battle with it. We recieved the Wand during our first battle. If it means anything, we recieved the Robe on Earthday, at around 10:00 (give or take a couple hours).
In other news, I was teaming with a level 21 WHM/10 THF there for about 3 hours, and I'm currently a level 21 MNK/10 THF. We were stealing nothing but beastcoins from the monster.
It seems to spawn in the east-north-eastern area of that circle drawn on the map above.
Good thing about this area for level 20ish folks is that you can farm Fire Crystals like MAD inbetween the NM spawns. We got at LEAST 100 fire crystals between the two of us within the 3 hours of mindlessly slaughtering Orcs there, not to mention the ~4000 gil and 2000xp we each earned.