I recommend using a scorpion to tame it, pump all levels into health on the scorpion. Then just attack the Rex but with 10 to 20 seconds in between hits, DO NOT pump anything into dm. Also this is what I use to tame literally everything, and it doesn’t even cost anything. Pls put this up in chat for everyone to go “oh that’s not a bad idea” 👌😄👍
There are different ways to knock out Rexes but Traps are probably the best solution. You can use three Stone Dinosaur Gateways (Rexes can't destroy stone) and a Large Bear trap by leading the Rex into the BTrap and surrounding it by Gates. Or you could also use a Raft Trap which is a better way to spend resources, since you can move it instead of remaking Traps. You can also get your knocked Rex to safety by taking advantage of the movement capability. I currently cannot think of any other ways to trap a Rex, but if this was helpful, please leave a like. ❤
If you use the bear trap strategy which is if you lead it into a Dino gateway that is shaped in a triangle and with a bear trap in the middle (Large Beartrap) and when it is stuck you must put a dinogate behind it to trap it and then knock out.