I was searching for high lvl rexes on lava island and found a 145 carch on lesser one instead. I instantly decided to tame him and spend like 1,5 total. A lot of time he was doing stupid things but now I understand how to tame it, how I did it in the end:

Crafted like 4 stone gates, placed 3 in the form of half circle

Agroed him and made him attack gates

While he was busy locked him

Went away to rerender, it will make him stop attacking gates

Lure a rex and kill it

Grab his body and offer him

If he doesn't sniffing or eating rerender again

After he eat it freed him

Commite massacre killing rexes, carnos and argies

We are friends now, he is awesome:)

Up this if you think it helps! Carchar will be buggy when trapped and could constantly attack giving you no chance at gaining trust. Seems to prefer small dinos and doesn't try eating flyers. If it misses the first chomp on the corpse then it will no longer gain trust on the corpse you are feeding it. You must be carrying the corpse while it is feeding on it. I found it easier to gain trust by building a walkway so it has an easier time chomping the corpse. After gaining full trust I found it easier to gain taming on extinction with the amount of dinos near the spawn. I highly recommend using an elixir on high level carchars so that you can tame it without having to gain it's trust again.

Finally some last pointers to help out...

I found using a baby rex (boss rex) was instant trust when it chomped on the corpse. Carchars will likely sniff the corpse you bring it and not chomp, meaning you have to render in the area by leaving or you may or.may not have to kill it if it stops trying to chomp the corpse. I forgot to mention that I don't know if just any baby rex will do so be wary of that. The carchars will most definitely kick you off after it reaches 100 stacks, so take it back to your trap before 98 stacks. That should be all you need to know! Hopefully this helps!

Traps are not good the carcha may get bugged and not eat just use a tek suit or gen 2 armor and drag body then fly

I can confirm after my taming experience that feeding it boss baby rexes gave it a ton of friendship.

Can't knokout tame it have to drag corpses to it it is a hard to tame thing

Trap it with metal

Boy don’t let these be Cryo-sick!! I think it has one of the highest Torpor and slowest torpor reduction speed in the game…so yeah, do with that what you will!

Is it on mobile yet? Why I asked is I play the game on my tablet an have not seen it yet.

Bring it trike and morellatops bodies, and get a few bodies stashed away in case you can’t find anymore Dino’s fast enough, I tamed my first one last night, but my cryopod glitches and kinda just ate it, if you have a quetzal with a platform saddle bring that; but bodies on top of it and bring them down from that when it’s ready, this way you can stay out of reach

To instantly ride The Carcharodontosaurus. Drag one high level Rex to him. When he sniffs let go. TRAPS are not needed and may bug him out. If you are holding/dragging Dino/animal The Carcharodontosaurus will not agro to you.

Slaughter baby boss Rex’s, drag till it sniffs then run or fly away. When the green icon appears above its head get on and ride! Don’t waste your time with alphas either cause it won’t kill them! When it kicks you off repeat the slaughter process and get on a ride!!

Feeding the Carch Gallimimus brings its friendship level up by a lot. I would recommend using them.

Baby Rexes work like a charm. Whoever suggested them is the GOAT

I have found that the higher drag weight the more it fills the trust bar.

Don’t trap it just kill some things run up to it. It will make a sniffing animation just drop the dino you carried and run and get some more then when the bar turns green hop on it and go on a killing spree. Easy tame.

High health diplos to perfect tame

Don't go for creatures f size they do barely any more than Suize I think lvl does nt matter and fish don't work when I tried go on a beach kill dodo swamp is filled and so is arctic and redwoods

Passive tame. Kill a large/heavy Dino and drag it near the Carch. It will sniff and then eat it. Rinse and repeat.

YouTube videos are wrong - do not knock this out!

You tame it by killing creatures and carrying them to it. Then, you ride it and kill creatures with it to get it to 100%. If the time runs out, then you gotta do it all again .

It is out and to tame it you need to trap it and I mean trap it so kill and creature you can drag and bring it to the Dino and it will sniff it and then eat it so this untill the mark above it is full and break the trap and ride it and kill everything untill it is tamed note the bigger the creature you feed it the more taming effectiveness you get

For the first time the Carcha the only giant carnivore in the game, has to be passive tame. In order to tame it you have to drag a corpse to the Carcha, it will sniff it and eat it. A unique taming animation will play. Then you have to wait 10 minutes till you feed it again. Up this so the others can see!