Challicertheriums are good for a Dino easy to tame once you get a beer barrel and they do decent damage for there size making them great for substitute for megatheriums along with that Daedon and yutraneous are great you could use yutraneous instead of Rex’s keep note daedon heal though you have to maintain there food so ride the daedon set the yutraneous to autocourage and with your rest of your yutraneous and challicertheriums attack the boss