Have a shield and block until it swallows you. Don’t bother having armor, it’ll destroy it all anyway. Once it swallows you, drop high level gear till it knocks out. You then have a random roulette of resource to gather (stone, wood, keratin, raw meat, prime meat, metal). You have a set time before it kicks you off. Repeat till tamed. Good luck, tamed a 145 and it was kinda rough!