If you want a world of butthurt, level up both coral highlands and wildspire waste. What'll happen is this: you'll eventually see both gold rathian and silver rathalos on the map together. And if you try fighting one, the other will continuously be called back, so you'll be almost perpetually fighting both simultaneously until one dies. I would know, I did this. I fought silver rathalos in the coral section and every time I fended off rathian, rathalos called her back after only about 2-3 minutes. Dung pods wouldn't work. On top of this, deviljo was also present, but thankfully dung pods work on him. At some point things got weird, the "gold rathian is soon leaving the locale" notification popped, and when rathian effed off back to wildspire, she stayed there, but then the rathalos left coral and flew over to her zone. So I went over there and dealt with them there for a bit. Eventually fended off rathalos causing him to fly back to coral, so I decided to flashbug rathian in the face so I could make a clean getaway back to coral (rathalos was my initial target of interest). I got 3/4 of the way back to coral when @$$hole decided to leave and fly back to wildspire again. So I hauled all the way back there, dealt with both AGAIN, only this time when he left I immediately flashed rathian and ran far enough away I could use tailraider transport and when I got back to the rathian, the prick was just about to fly off but luckily I saw it coming so I flashed him down and started fighting him again. And killed him. It was sh!tty and I recommend noone do this unless they want a real annoying challenge. Dealing with both these !@#$ers simultaneously was horrible. The only thing I can think of that would be worse is fighting both toaster and moonbutt together.