Hello, and welcome to Monster Appreciation Week: Brachydios!
I know. Finally. It everyone's favourite exploding theropod!
Monster Hunter 3 Ultimate
Brute wyverns coated with an explosive green substance. The material is thought to be a unique myxomycete--or slime mold--that is primed to explode by the Brachydios's own saliva. Note that these crafty creatures can also deliver powerful foreleg strikes.
This Article lists all the Brachydios Weapons and Armors that can be obtained in every game.