Tame the mega during the day! It is extremly slower during the day due to wanting a rest. It is a very strong dino, it has been tested to be even stronger than the allo! Be careful if you tame it at night ;) caw
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.
When taming a high level megalosaurus, you need to put down right when night starts. It sounds counterproductive because it's stronger, but it allows for maximum starve time since you will need to put it down again the following night. If you don't do it this way, you may end up needing to put it down a third time, which could very likely be the death of it since it won't regain any health over that time.
Also, tame with a friend because the megalosaurus will pick you up into its jaws which makes it very hard to do solo without dying. Your tribe mate can attack the Dino and cause him to drop you.
Can be found in Carno island cave, south west lava cave, south east cave near Stonehenge, Central cave near volcano, and possibly others. They are very rare spawns but if checked regularly you can encounter them if looking to tame.