User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-6050823-20141017204827/@comment-25083735-20141018031128

Ok so the dragonator got "old" so I am guessing thats why it was rusted, also the monster has been out around the wild so the rusted dragonator part is ok, and the gunpowder explains the tail swipe attack and how it cuases it to heat up and burn.

Also wanted to point out the fact that it said many years later, which is enough time for rust, and it was already old enough.

also dundroma is a "big" town, and goguma wasbig, but didnt make much noise in the intro besides the sad face part. At first I thought the oil came from dundroma's oil and coal supplies.

and one more, Kut ku eats coal, so does rath and gravios.