The Megalosaurus is very good for fighting the Dragon, possible better than the Therizinosaurs, when you bring them to the Dragon fight, they don't get attacked by the dragon, the dragon only locks onto, allowing them to deal damage without dying, to do this properly I would suggest riding a tanky Therizinosaur just in case and bring 19 megalosauruses (or 18 if you want a Yutyrannus, just make sure the Yutyrannus is following your Therizinosaur while on passive with "ignore whistles" activated) you could even do alpha dragon with megalosauruses if they're strong enough (NOTE: MAKE SURE IT IS NIGHT TIME WHEN YOU SUMMON THE DRAGON OR THE MEGALOSAURUSES WILL TICKLE HIM)
The megalosaurus is one of the strongest therapods, but its nocturnal sleeping pattern make it significantly less effective during the day. The megalosaurus can bite and even latch onto enemies — including humans — and swing them around, hindering their ability to move. This carnivore is stronger than a Carno or a Rex at night, but during the day, it is much more slow and sluggish.~Steel Cookie 123
The Grizzly bears of Ark on the island. These dinosaurs may be hard to find on moblie devices, on moblie this thing is only found sleeping in caves. Cave of the clever is the most frequent spawn of this guy. DO NOT TAME AT DARK: they are twice as fast and can murder mounts as fast as a arthropluera ( the giant centipede ) also be careful as while its sleeping, it may look like a rock, make sure not to jump on a “ rock “ with a few tufts of fur.
These guys are a must-have in Aberration; they are always awake (at least in the bioluminescent area), and thus always have their night buff. Of course, this also means you must always be wary of wild ones while in their territory.