First you need the diablos quest then when you fight him you need to break his horns off
by making him ram into a rock wall etc. once you beat him it should appear in the rewards
section note: bring alot of flashbombs. :)

or u could trade a cephalos fin for a twisted horn with the village elder in jungle(area
5)

dumb bicth it$ not a cephalo$ fin it$ a ple$efio$e fin u vvanna novv hovv to get that u
trade a cephalo$ fin in hill$ and Vuala there u go i made tvvi$ted bovv atack 305 and all
amunition u need tvvo i kick vvyvern$ A$$.

but i am in the begining of the game. cen i stil get it.

dimana saya bisa melawan diablo?

where I can fight diablo?

Como eu fasso pra obter o Twisted Horn?
Aguem ajuda porfavor T-T

Hey,my monster hunter ps2 have problem. I want to go to farm but there isn't jamaican guy
standing near the way to farm.

You need fight daiblos in quest '' the run away daiblos'' you cut off his horn it appear
in reward.
Hope help this. It is correct