Step 1: I just want you to know these things are strong and it i will jump over a 2x2 trap so make a 2x3 and the doorframes 2 high

Step 2: next you will want if on mobile to do hunt solo quest the bow will help you out and get about 50 tranq arrows depending on the level of the therizino ( just put in the damage of the bow and level of therizino it will tell you how many arrows you need ) and on console or pc you will want a longneck rifle with tranq darts

Step 3: after you knock it out it has more torpor than a pteranodon but loses it twice as fast and loses its food as fast as a pteranodon so I recommend a lot of vegetables (like carrots) and bio toxin to tame it