This is actually deceptively easy to tame if you do a little setup. You will need of creatures with super high health you don't mind losing (cryopodded), a baby yutyrannus(cryopodded), a large bear trap or two, and 4 metal dinosaur gateways. Once you find your carch, place down 3 of the gates in a \_| shape, with the opening facing your carch. Place your bear trap(s) inside. After that lead the carch into your trap, preferably with something that's fast and can take hits. Once it's in the bear traps, place a final dino gate completing the square. Once that's done, put all your carnivorous creatures on passive, and slaughter the baby yutyrannus. Drag it's corpse over to the carch wich should sniff the air and then eat it. Beware of argentavis, as they will steal the corpse. Once it has eaten the corpse, the carch will temporarily become ridable. Dismantle one side of the trap and walk it out. Next, you'll want to uncryo your high health tame and make sure it is cryo-sleeping. Once it is, unclaim it and then mount the carch and eat it. Repeat the past two steps until your carch is tamed.

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