Dont be scared of them, get a flyer and make sure to have a high health and stamina, fly at him (make sure its only one or your dunso) and let him take a bite of your flyer once in a while then lead him into a square wall of dino gates with a trap in it. Once he is stuck quickly close up the open gate, laugh at him and shoot him (alot)

How to raise and tame a good Rex

1. Use crossbow with tranq arrows or rifle with tranq darts

2. Find the Rex a tough opponent to defeat

3. While he or she is fighting, open fire on the king or queen

4. Once the Rex is down feed it prime meat alongside with normal meat in case you run out of prime

5. Use narcotics on higher levels bio toxin might be needed.

6. Once the Rex awakens take them hunting for large dinos and bosses too but they have to be extremely high level

7. When leveling up switch between health and dmg upgrades

Please take good care of your tyrannus. PEACE

Step 1.get a bow or crossbow

Step 2.get a crap ton of trank arrows

Step 3.find a rex

Step 4. Find a cliff that the rex can’t climb

Step 5. Lur the rex to the cliff

Step 6.shoot the rex until it is knocked out

Step 7. Feed the rex raw meat/prim meat

Step 8. Enjoy Your rex

Two things:

First, if you want a good saddle for your Rex, run cave of the strong, which you can do with a cave tamed arthro, good fur and a few med brews and fria curry.

Second, since this is a popular page, I’ll give some free advice:

(For Mobile players only, playing on single player casual mode!!)

Run hunter cave and tame arthro.

Upgrade weight on arthro like a ton.

Run strong cave, and set a thatch foundation with a bed right by where the artifact spawns.

Leave cave.

Tribute strong artifact.

Put a bed and a couple large storage boxes on or near an obelisk. Put all of belongings in storage boxes and fast travel to the bed you put in the strong cave(make sure to save game and relog onto it before you do this) grab artifact and go find a creature to kill you quickly.

Spawn at bed near obelisk.

Tribute artifact of the strong, put loot in storage boxes and repeat until satisfied.

This technique will give you ramshackle to ascendant level giga and Rex saddles, and same level scuba gear, gas masks, and compound bows. Also, since all you need is the level to get an arthro saddle, you can do the strong cave early, and use this technique to get enough gas masks or scuba gear to do the swamp cave(also noted for its difficulty)!

Sorry that this was so long, and please forgive any mistakes in the message, I’m quite excited.

I tamed a lvl 40 male and a level 150 female and now I have an army of either glass cannons or tanks with no damage. I’ve searched everywhere for a 150 male and the best I found was a level 75. Atp I might have committed Rex extinction with the amount I killed for new ones to spawn

To add to most on here, the best way I've found is the cliff method but just in case you don't have a cliff take 2 metal billboards and place them in av shape using a tame with high hp find your rex of choice, coax it to the v, then tranq it with your tame behind you, once it's in the v use your tame as a door for the opening of the v.

Start the tranq process and knock it out, once knocked out use exceptional kibble for best results, keeps tame percentage at 100 and you get the extra lvl you need for it, yes they're tanks but with the rise of the giant bugs, they can possibly take down 1 low lvl but not 2. I was lucky to survive a mid lvl bug and a theri aka tickle chicken, also one the rex is down so reference the starve timer on here with the kibble for somewhat faster taming

I had to knock out a 135 rex out with a slingshot. On day three. I had used my crossbow, two other bows, and all of my tranq arrows. I had absolutely no choice, but to knock him out with a slingshot. It took many stones and tears. But somewhere around 150 stones wasted, I knocked him down fed him, and he was tamed.

Place 1 stone foundation near the rex you want to tame, (not too close) then 1 doorframe and door, both stone. Then place 3 stone walls around it. Add an extra layer on top of the base structure of stone doorframes then cap it of with a ceiling. Shoot the rex to get it’s attention, then run inside and the rex won’t be able to hit you, but you’ll be able to shoot it. This trap also works for Spinosaurus and dire bears.