Make a 2x2 cage with ramps and a door. Lure the velonasaur in with a flyer. If you stay close to him he won’t enter turret mode. Leveling melee raises his projectile hit points. Also level stamina to attack longer. A high level can shred everything I’ve come across. Can’t wait for an imprinted one for the speed bonus.
You don’t need to trap this to tame, it’s a solo tame. If you run up to it, it will go into turret mode then you need to walk circles around it and keep hitting with tranq until it eventually tries to walk away *in turret mode so really slow walking*
About a couple weeks ago, I was so lucky I was fooled into thinking a Velonasaur disregarded a shooter when mounting an Allosaur. Just now, I thought about how a Stegosaurus protects it's rider from arrows, and then shot at the Velonasaur between the plates in Hardened mode. I got very little damage comparatively, and knocked it out in relative peace. Stegos are the key, my packmates.