It may look easy or might be easier to tame.

You just need at least creatures with drag weight, mainly

•𝐑𝐞𝐱𝐞𝐬, 𝐒𝐩𝐢𝐧𝐨𝐬

•𝐆𝐢𝐠𝐚𝐧𝐨𝐭𝐨𝐬𝐚𝐮𝐫𝐬

•𝐁𝐫𝐨𝐧𝐭𝐨

• 𝐘𝐮𝐭𝐲

Or anything that's an apex predator or a creature around and above 500 drag weight

Though you might need to get their baby variants via tamed creature breeding, for those who might not have cryopods (like me) you might wanna pre-hatch the egg (Keeping the egg incubation at 5 or more) then kill once it's ragdolled, and slowly but steadily sacrifice the baby to rise the trust meter if it's drooling (passive state with head close to her body) if it sniffs, it's good to drop the sacrifice and back up a a few meters away because you'll never know when she'll jump or not, make sure to at least keep carnivores away from the sacrifice corpse because they'll eat it (why keep them away alive? Because you need it for the second phase)

Once that's done and allows mounting, just jump at least any creature, (mostly the bigger ones with health) and try not to get hit because if you get hit or accidentally jumped off the landscape (due to it's speed) that decreases the taming efficiency and since the Carcha has a hell lotta damage it might be easier, though It'll be reduced by 80% once tamed but to tame it you'll have to avoid reaching 100 kills, getting damage on the Carcha too badly or letting the time run out because they will get the Carcha buck you off and bite you.

(I just realized this could be shortened)