A really good method I used to tame a lvl 130 was to get my snow owl (anything will work as long as it has 3K health minimum), land it right next to the velonasaur, wait till it aggroed and jumped off, from there what happened was it was too close to my snow owl to use turret mode so it used the swipe which does pretty much no damage. When I started tranqing it it was focused on my snow owl and kept attack it until it started torpor running even though I was right next to it. Up if you find that this works because I’m not certain how reliable this is

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