The Legendary Bloatfly is in Dead Wind Cavern, for some reason it has been misnamed and mismodelled as a Deathclaw, though :shrug:

I heard it has a deadly weakness to rolling pins and characters with a carry weight under 5, they kill it on one hit.
If so head to deadwind caverns like this it'll be the easiest 5000 XP you can make.

Wild Wasteland Encounter: Overly Bloatedfly
:thumbsup:

Why not go all out..make a Legendary Glowing Behemoth Bloatfly

Call it the Lord of the Flies.

There should be a Legendary Bloatfly, and it should be like the mother of all NV monsters. 10x the health of the Legendary Deathclaw, insta-one-hits the player, summons swarms of bloatflys to aid it in battle, etc.

Would make for a great Wild Wasteland encounter.