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!

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