To tame the rhynio you will need to find a male (drops rhynio pheromone) and kill it. Part two: The stronger the creature the better the rhynio baby, I recommend a Carchar but if Carchars are limited mutated brontos work really well. Part three: Find a female rhynio and trap it, after trapping it get the rhynio down to low health, throw out the Dino that you’re feeding the pheromones and wait for the rhynio to impregnate your Dino. Make sure that your Dino is on passive or it might end your plans to tame a rhynio. :)