Taming one isn't easy because they are fast and strong. All you need is a dino and shoot it from the back or hide on top of a rock and start shooting it. Once knocked it be prepared to waste the most narcotics and narcoberries you have every seen. So have a bunch of narcotics or narcoberries. To tame it have crops because it faster but if you dont have anymore just have meoberries just in case you have no more crops.
I found this little cliff area and put a lot of stone pillars in a sort of wall formation. I then baited the boi into the gate and then tramped him in with remaining pillars. Afterwards I went to town on him with with darts (About 50 even though he was a level 240) then BAMM! The murder nails boi was mine. :)