Okay, people keep saying the best way to tame them is with a megalosaurus, but I found an easier way. (Im using mobile so this might not work for non-mobile)

I used a cave scorpion as it’s just a megalosaurus but easier to get. I just walked up to one and tamed it while riding my cave scorpion. I didn’t use anything special, just spoiled meat and a tamed cave scorpion. I was only level 28 and only had cloth clothes on.