If you have a pteranadon, 4 stone Gates and a large bear trap with around 20-35 tranqs in a crossbow you can take it down. Imagine a square of Gates, except there's one missing and a L bear trap in the middle. You lure It from the side with the gate missing. when it gets stuck, cover up the last gate and you can fire away. You can use whatever you want for taming. You can also do this with the rex.
Hey, ok so the center, coordinates 08.1 / 63.4 spinos will spawn there, if is not high enough just kill it, leave the area and come back after 3 mins. Normally works, I found a 150 and I'm taming it rn
stand on a high cliff and shoot it or keep shootong it and running away on a raptor until it's knocked out. it gets distracted very easly by fish, sharks and manta's (even while chasing you) so you may want to shoot it while it's distracted.