Im writing this from my experience: I needed 5 beehtmoth gateways and 1 dinosaur renforced gate. I used a diplo to do the sacrifice and an argy lvl 75 to get the Rhynio trough the gates. Then I shooted her with a long canon rifle and a crossbow. Then I made her impregnate my diplo. For the défense of my diplo I brought my giga in a Cryopod but I think that a Spino is good enough for the protection while the Rhynio kid is being born