1. Mate one of Spinosaurius, Pronto or Rex, and save the fertilized egg for later

2. Trap the carcha using metal gateways and large bear traps, I used a 6x6 to allow for movement, 3-5 large bear traps

3. Incubate the egg and hatch it, (don't claim the baby), cryo the baby or soul trap it and take it close to the carcha trap. Euthanize the baby, and give it to the carcha from your hand. This will fully fill the trust bar

4. Ride the carcha and kill as many wild dinos as possible. Here size doesn't matter, you can quickly kill many dodos and still will count through the taming process