When I was taking my Ferox I found that if it comes to you and rampages it will automatically tame to 33% or depending on your ferox level if I’m correct. So if you so happen to find one your taming and does this it saves you 1 element. This is on genesis so not sure about other maps. I don’t know if it just mine or what but keep this in mind when finding one or running into one
As of 3/28/20. Ferox will tame at the wrong level but once put in cryopod will correct to tamed level. A live 145 changed to 217 once in pod post tame. Also dododex is not accurate on x3 possibly x1. The same 145 took 20 element for full tame. At 5% per element.
These things are really easy to tame in genesis 2, the hardest part of taming is finding them. All you need to do is feed them element and hover above them just out of their attack range but not too high because they will in Agro on you and run away. Up if this helped:)