Even with a longneck rifle, remember to lead by a LOT when it's flying horizontally past you. Small hitbox + lag = some arrows and darts registering hits on your screen, but not on the server. At 30ms lag it's about a body length inc. tail.
Bolas really are the best plan, to get them to SIT. THE HECK. DOWN. You need to lead more because of the slow travel time for bolas, but getting the dimo down is such a relief.
Aggroing headshots also works, but can do more damage than you intend. Make sure to bring a lot of bolas, and maybe clear the dimo's flight path of other dangers first so you don't, y'know, run directly into an alpha raptor while staring at the sky...
Ghillie suits are great if you're trying to snag one in a dangerous area! Good luck building your death swarm.
Be careful when taming one of these, as while they may be cute, the only way to tame them is to knock them out and offer meat while usually keeping them asleep with sedatives like narcoberries or bio-toxin. Because you have to knock them out, this means you have to engage them in combat while bolaed, or quickly shoot them with a tranquilizer arrow. And remember, if you hurt one of them, their buddies won’t see that you are trying to tame them— they will only see AGGRESSION, which they take very seriously. And if you think the worst they can do is give you a tiny scrape, you are SORELY mistaken. THEY WILL RIP YOU APART if you dare try to tame one while it’s family is near. See if they don’t. They are kept commonly as a pet for their small, skinny size and tiny noises, yet when traveling, if whistled to assist you, they make a great guardian when it comes to melee combat situations, provided you have you Dimorphodon perched on your shoulder.
This isn’t really a tip but I had this dimorphodon named Eagle who was super quirky and occasionally killed things that tried to kill me from compys to allos. On day a theri wandered onto my wooden base and guess what happened. 20 of my BEST tames were slaughtered along with my best Iguanodon for travel. Eagle tried to put a stop to it but was killed in the process. All my other creatures were passive. There wasn’t even an implant to revive her with. D: I was so filled with rage, I trapped it and killed it slowly and painfully with my lvl 131 dodo. Rule? Kill and aggressive creatures before they kill ur pets.