I have a very very very easy way to tame them that i used my self.

First choose one high level (i was choose 405lvl) go near him with high level arge (mine was 682 and 10k health) then let him chase you take him far from thear normal spawning location on any mountain side so that he will not eat food there then for 8-9 hours to make him hungry then trap him with 5-6 dianosour gate and shoot him traq dart then see his stats he is hungry very much so give him 15x balm and allo kibble he will be yours in 1 min.

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