Can be tamed solo if you are fast enough. The second it grabs your tame, jump off and feed it. It will let go of your tame. Then simply remount and kite it around until it’s ready to feed again. Rinse and repeat!
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!