RAG TIP: Go to 44 10 for squids, let one follow you to 28 6, it's a huge chasm where nothing spawns so nothing will distract you, I've timed 3 squids just by having it grab my turtle and swimming away from it; swimming 10 feet up will cause the squid to lose interest. First feed is instant, second is 25m wait, the next one is 15m on x2. Worked everytime with no issues.
You need two people, one for feeding the black pearls and the other to feed the turtle that is in the grasp of the Tusoteuthis, with sweet vegetable cake for the health and to feed it stimulates berries as well
Just tamed a 150 on an official server. Building a trap high off the ocean floor works great just trap it and rotate out 150 tamed turtles hp pumped. Took about 2 hours with pearls for the tame. Took 50 pearls every 5-10 min. Happy taming!