User blog:EmperusDraco/Four Horns Mission:Help!

The Blog's back with Mr.Black tailing behind.the black Diablos has been known and nicknamed as "Mr.Black".Ok we all know that you killed it already,but did you have enough time to kill the other one?well I did'nt,so does anyone have tips on how i should kill it with enough time to kill the other one?what armor,weapons and Items should I use?what strategy should I follow?please help me.