To tame, find one alone. Otherwise, if you attack it, others will come out and attack you, and they can be an annoyance to kill. Once you have found one, wait for it to land and bola it, making the dimorphodon immobilized. Now you can easily tranq it will arrows or darts and tame. Make sure to bring a couple narcotics or biotoxins depending on the level you are taming, because the torpor goes down fast. If you forget, quickly gather some narcoberrys from nearby bushes before you start tranqing. While it is taming, you can get some more berries if you fell what you have is insufficient. However, if you don’t do this, it will eventually it will wake up and that it, you’ll just have to repeat the process. Overall, it is a pretty easy tame.