Build metal walls on a METAL foundation otherwise the giga will get out of the trap when you lure it into the trap. Make sure the walls are tall, and put a large bear trap in the center then make a metal dinosaur gateway without a door, but make one and put it in your inventory then get on a flying creature then stay low to the ground and make the Giganotosaurus follow you into the trap then fly up. Quickly put the door up while the giga is trapped in the bear trap. Then tranq it.
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