You have to tame one they are good fighters and fast and im gonna tell you how to tame one in 5 steps

Step 1: you have to craft 4 mettaldinosaur gates and 1 beartrap

Step 2:now you use 3 of the gates and place them like that: |_| and the beartrap in the middle

Step 3: the hardest and most dangerous step, you need to get him agro at you and lead the giga inside, the best way is to fly with a argy or pteranodon (i use argy because i think its better) but be carefull he is strong and can kill you easily

Step 4: when he is trapped in the beartrap go fast behind him and place the 1 gate you have left so he is stuck

Step 5: begin shooting at him with tranq darts or if you ran out of tranq darts you can use tranq arrows too dont worry

Step 6: when he is knockt put meat in his inventory or exceptional kibble (kibble is better)

But be carefull his tranq is going down fast (very fast) so you HAVE TO use narcotics