Easiest way is with two people. Bring longneck, shocking Trang darts if you have them. Something tank to protect and take hits like a Carcharodontosaurus, a snow owl and a tek suit. Person on carcha takes agro and clears area. Person with longneck tranqs it while using tek jet pack if you have one. As soon as it stuns person who is tranqing jumps on and rides it while charcha rider protects by taking out the larger wild dinos. Person riding Ossidon calls out when he is about to get kicked off and carcha once again takes agro. If needed at this stage person who is on tranqing duty should pull out a snow owl and heal the Ossidon by freezing him. Rinse and repeat