For old ark mobile only: The best way to tame a giga like all others, is to trap it with metal gates. You can even do it close to it on a mount really. Just make sure not to dismount. Then, set a tiny camp with a roof on a sleeping bag to starve the giga. Forcing it to eat super fast. Also make sure to use soothing balm with it as well as using big bird kibble. After a few seconds depending on the giga’s level, you have yourself a hugely nerfed dino