Get a stone behe gateway and gate frame, along with 4 metal Dino gates. When you see the giga find a spot close by where the cliff has an indent and you can place the behe gate there and trap the giga after closing the gate. Then place the 4 Dino gates in front of the gate and once you do that you can open the behe gate and fire away until it is knocked out. Good Luck and Enjoy!
I dare you to raise one!! They are savage if you got two high lvl parents (about lvl 140ish) and you get imprinting on it. The thing will become an adult with about 230% melee and basically one chomp any bronto!!! But on the down side you loose your job and your girlfriend
Make 4 metal dino gates and 1 large bear trap. Place three frames and door into an incomplete square and the large bear trap in the I between them. Lure the Giga into the trap and while its trapped place 4th down to make the square. Then just light it up with tranqs