Get 19 rexes with 40k health and 600 melee with mastercraft saddles. They will be used as crowd control for the dimorphs and teras. You will need a male deer with 10k health and a journeyman+ saddle. Get the deer under he dragon when it lands so it gets stuck. Have shotguns with 180+ damage to them shoot the dragon. And also, make sure you have journeyman+ tiered flak to bring in too!! 2-3 sets of armor recommended
First of all you can’t knock it out just like all other bosses. Second, in order to kill it I would recommend mutated therizinos with ascendant saddles, about 17 of them. You can give the therizinos sweet veggie cakes for them to heal on their own. I would bring 2 daeondons and 1 yuty which are both better when someone is riding them.
Nock him out with a stick. This can take a great deal of time. Then take a self-made recipe (5 Wyvern milk, 3 potions of forgetting, 2 giga eggs and 10 trex eggs) and give it. He needs this several times, about 100 pieces of the recipe. After that you have to wait a very long time, it consumes very quickly torpor, and takes about 19 hours to around. Then you will notice that it was pointless to read this comment and that you wasted your time