Build a raft, place lowered foundations on raft, place door frames 5 high on right, left and back side of raft. Place 6 ramps on front. Drive around till you find a 145 to 150. Scoop it up and bring it to your nearest cliff. Get up on a rock or ledge and tranq dart till it’s out. Make sure to bring the right kibble and follow dodo dex taming instruction’s. Just tamed a 145 that came out to 207. This has always worked for me.
Be aware of Genesis' X-Spinos, like all "X-"Dinos, having significantly increased damage resist, resulting in way more tranq darts needed than stated above. If you're going to tame an X-Spino, take at least double the amount with you!
I had a Spino once. His name was J.J. I loved him. But like always, good things always come to an end. We were out looking for giant turtles for their keratin when J.J. fell over the edge of a cliff. I was on my pteradon so I flew over the edge and J.J. was following me back to bace when he was killed my a therizinosaurus... I just sat there on my pteradon watching him be torn apart, unable to help... So now, my bace is called Fort J.J. in honor of him. I will always remember my most loyal friend.
I was lucky enough to encounter a spino in the south-center swamp on island. The tight area made it hard for the spino to chase me and got stuck easily. Took about 20 tranq darts to knock and Lots of gators were around so the prime meat helped tame it in 20 minutes!
Genesis X-Spinos are worth the tame. They are like Bog Rexes that can swim. If you try to tame it, be careful to build a trap higher than normal Dino gates made of stone with a ramp on one side. This Dino needs Behemoth gates to fit through them, so anything smaller than that, but a bit larger than a Dino gate will do. Had one get stuck in my standard Dino gate trap, but it jumped out once it’s torpor got high and it found an area of gate that wasn’t perfectly level with the others and jumped right over and ran off. Taming with standard gates is possible, only if they are perfectly level with each other. Having a trap made of stone fence supports and door frames stacked super high will make escape impossible. Pillars work too, but make sure it can’t slip through them.