The easiest method ive found to tame a rex is to lure it into a taming pen made of stone dino gates. Lure with a flier or on foot by closing the gate furthest from the gate you entered from. Then close the gate behind the rex. ( yes rexs can walk through dino gates! So doors are nessisary) then shoot from a safe place till knocked out. Always bring extra tranqs with you and delay shots with tranq arrows to prevent killing the rex by accident. If useing a flier, argies have always worked best for me. Their extra health and slow pace keeps the rex on you as they quickly lose interest and go for whatever else is nearby. The starve method is the safest to prevent spoilage of whatever food source you use.
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” 👌😄👍
1) Insta Tame an Argy (get close to knockout drag a body so it eats and gets the healing effect this will drop its hunger so place whatever food you have for it and will be instant tame works on any level!)
2) Get that argy as a killing machine I recommend health n melee I use a 4.5k health one
3) Knockout Rex
4) While Rex is knocked out bring that argy around and kill whatever is near for prime meat I look for paracers
5) Tamed Rex
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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.