It is hard to tame rex due to having a partner or other creatures that might aggro on you or the rex itself. Especially the rex itself will aggro on the creature too. So all you need is a rideable creature to run around it and shoot tranq arrows with a cross bow and feed it prime or mutton if you can get a hold of a ovis.

What you needs to do is.

Requirements: long neck rifle with darts. A flight. Know that you need to lead it home without getting you or it killed.

Step one: find the area near the snow if there's a rex there

Step 2: get on the big rock and shoot him once to get his attention

Step 3: keep shooting him until he's down but wait 5 seconds each

Step 4: have your taming rates high if you want to feed it raw meat (4 bites)

Step 5: get it home hehehe

Step 6: make a saddle and YOU GOT A REX BOOOOOOI

If your trying to track 150s in bulk to setup a breeding operation, I recommend taking a high level argy to carno island, keep flying in in circles killing everything to get rex spawns. In about 4 hours I had 4 150s tranqed.. If your lucky there is some open space to build a rex trap. GL!

when getting the game your goal should be tame this. start with dodo. then a more deadly dilo. then a coward para. a fight back chad ingidon.

then a ladedeladedoyourtamesaremypropertynow raptor. then move to archys and bigger dinos (theino, carno, allo), then try a ferrous rex. see with a rex and bigger dinos you really need more of a advantage from food to knocking out weaknesses on the dino. lime the environment. then something annoying like a purlova or trodon.

To tame a levél 20-30 rex u will need atleast 20 őr 15 tranq darts(without missing)

Now when úr ready with úr rifle go with a beezulbfoo/quetzal bc rexes are to slow for them

Then shoot him and jump Behind him with beezulbfoo and shoot again

(Averege lvl 67 ark mob player)

Rex is strong and powerful when fighting against.

But you can easily trap the Rexy with enough materials. To trap the Rexy, you'll need the following steps; Build a basetrap, for the walls, you'll need to use doors (Rexy can't go through doors) you'll need 3 layers of door stackup, then build an upgoing path, and done! You have successfully made a trap! Now find a Rexy and let it follow you to the trap, make sure to not go to far from Rexy, or else it'll lose your attention, once you've done it, go to your trap, also make sure the Rexy is following you, once the Rexy is in your trap, start shooting it with a bow, it'll eventually it'll go down, then put meat onto it's inventory, and force-feed him, there'll be a taming bar, you'll need to wait a while, when you're done, you've tamed a Rexy!