Go naked on a high level mosa with 50 pearls get grabbed jump off and feed have your mosa following a basi it will swim right back to it after being released have a boat with a few beds and just die respawn and repeat just keep your pearls on either your mosa or basi easy to solo tame and the best thing to use in the sea
Use either Dunkleosteus or Carbonemys to tank damage as these dudes are only tameable when grappled onto something. They take black pearls in stacks of 50. If not Insta tamed it will be hungry for a next depending on its food stat so typically higher levels take longer between each feed. Get black pearls from mass killing trilobites, sea scorpion things (can’t spell name lol) and ammonites. You can get a decent amount from killing alpha mosas and tusos as well. Good luck!!
if you’re on crystal isles and see one on the shore you can tame it, hit it with a dino that could be carried you can use a land animals because you won’t need to go out far, okay so it should take maybe a couple hits for it to aggro hit it once if it doesn’t aggro take a 30 second brake and keep doing this repeatedly till it finally aggros on your dino feed it black pearls and it’s yours (ur welcome)
Read this, it might help you:
1: The best place to encounter tuso is 90-91 lat and cover all longitude from red ob to the end of herb Island.
2: Don't solo search, make a party and cover full bottom of the map.
3: Don't search in shallow water and surface, go for mid and deep sea.
4: They need to grab your tame then only can they be tamed.(Take Carbonemys with health and speed pumped)
5: They take 50 black pearls per serving.
6: They only agro in deep sea.
7: Last and the most important, the server must be brutal or their chance of spawning is not that much. Put server to brutal and for one day atleast go killingspree in ocean to open spawn spots for tuso.
8: Pump only melee and health to tuso.