I play official and have tamed a couple of these there simple but hard to tame first u want to trap it then u might need a second player to stay close to it so it won’t go out of the trap when u get out of tender distance then u find the swarm fish and u can use the HLNA drone to scan the fish to see what lvl the swarm is depending on the lvl the less swarm fish u need so if u find a 150 swarm u will be able to tame any lvl megachelon off that single swarm but u must sit there and watch it when I did it the first time I wasn’t looking and it kept resetting the taming bar even tho there were not enemies nearby so u have to keep watching it while it tamed or u can tame it with the glitch and all u have to do is do the same thing except soon as u Afro the swarm fish on the turtle use HLNA to teleport away and watch ur tribe log for when u tame it it will tame eventually while ur at ur base doing whatever hope this helps 👍🏿
They have patched the render range range so ignore any tips that say to leave render as it will no longer. Guess I’m stuck with the turtles I have, I’ve spent three hours trying to take one of these things and had it walk out of the water which reset it taming! It was at 80% that time. Never got it above 20 after that. What he for the saber tooth salmon that spawn to kill the swarm if they bite the turtle it resets to zero and you start over. Extremely frustrating way to tame a creature. I would like to beat whoever came up with this idea.
Lead it into a line of stone behemoth gates and close a gate behind it and it will be trapped or you make a square box of Dino gates and nothing can mess its taming up while it’s being tamed so up this!!!!!!!
Preparation is key to not spending 10+ plus hours like I did the first time trying to tame. First setup behemoth gates each with doors in the shallow water as a trap. I'd say 5 to be safe but can be done with just 2. Allow space between behemoth gates big enough for a mosa to fit tightly between. Make sure you have a speargun or crossbow to kill coels and sabersalmon since they spawn and eat the fish swarm. Go ahead and trap your megachalon. You dont need a roof on your trap since the creature gets stuck in the doors. Here's where things change depending on solo tame or duo taming. You must be within a few blocks for it to maintain in taming. So if you have a partner, choose who will stay with the megachalon and who will be pulling swarms to the tame. Put poop in your last slot to maintain aggro of swarm. You most likely will need multiple swarms. If doing solo, get at least 4 swarms just out of agro of megachalon before starting and then kite each as needed to the tame.
Its either the easiest tame or the hardest, have a basi or megalodon tame ln follow that you can hop on to kill any wild megalodons, but once the fishes start cleaning the megachelon you will have to be swimming with a crossbow to kill the salmon and coel that spawn into to eat the little fishes. Takes like half an hour to tame, easier if you have tribemates.