Starting with a lucky shot I got a long time ago (ironically I replayed the whole fight again to gain experience from Scorpion).
To fight the Monster Goat, you need any custom ranger that has the "Goat Killer "perk in the past. Travel for some time in the snow-covered area of the upper hill, and sooner or later you will find this encounter. In my case, I'm fighting a Level 29 Monster Goat.
As for the Golden Scorpion - he is waiting for you in this small square near Yuma. He doesn't scale with your party, so it's dangerous to fight him underleveled.
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