Very easy to tame if you know what your doing. First tame an Ichthyosaur. Then grab a crossbow and some tranq arrows and find one and knock it out. It is not be able to attack if you are on the Ichthy. As you are taming it, be sure to remain on the Ichthy unless feeding narcs, so other creature don’t hurt you.
Bring more tranq arrows then you think! Mine took 100 at close range, on the body, at LEVEL 3.
I took cooked prime meat (stays better longer) and got mine in only four feedings. On an icthy they don’t chase (mobile player here) happy taming- Survivor Belle
They take the most amount of tranqs to knock out out of any aquatic knockout tame. Since the x-dunk takes %40 the damage of a regular dunk, it makes it one of the hardest things to knock out. However, it’s extremely cowardly, so if they dunks try to surround you, one tranq is always enough to send them running. Plus, plesios, megalodons, parakeet fish schools, anglers, Electrophorus, Mosas, and of you’re unlucky enough, Tusos, will come from every where and try to kill you. The only good news is, knocking it out is the only hard part. It’s a very quick tame afterwards, and doesn’t require any narcs most of the time. Stil, the x-dunk is one of the hardest things to knock out in the game lol.
Just tamed a 140 X Dunky. Yeahhh, really recommend that you build a trap for these peeps, spent 40+ mins trying to knock out this bad boy with a decent crossbow all while dodging tussos ect. Good times, stressful but good.