To tame it just make the classic trap, place 3 metal behemoth gates in a square shape, keep some space inbetween them to shoot from the outside, then place 1 or 2 large bear traps in the middle of the three, make sure to make the trap on a flat area, open one of the gates (it doesn't matter wich one) and lure the giga into the trap, a pteranodon should be enough to do this, make sure to hit the giga at least one, i recommend aiming at the tail otherwise you'll get destroyed with 1 bite, onche the guga enter the trap, it will be caught by a bear trap, you have a few seconds to close the gates then beggin shooting and have a lot of patienece, stay away from the trap, something like 30 m should be safe.

If you play on mobile go to the lava cave at the southeast of the island and tribute the artifact of the massive until you have an ascendant rifle with at least 1000 damage, with this rifle you'll knock out the giga a lot faster and with less darts and you don't have the risk of the rifle breaking mid-taming, also go to the cave at the south of the island to get some soothing balm.

A lvl 150 without soothing balm and ascendant rifle will take more than 500 darts, it will break at least 1 rifle and will take more than 50 prime meat, that's a damn lot of brontos even with a high level rex, and mot of the prime meat will also spoil so you'll have to keep an eye on the giga very often, it will become anoying if the taming is far away from your base, and the giga will also need more than a whole hour to tame, also the tamimg efficiency will decrease and your giga will lose some levels.

if you have an ascendant rifle and soothing balm a lvl 150 won't take more than 200 darts, it will fall asleep a lot faster, it will only need like 6 prime meat, you can get that from a few brontos, stegos or mamoths in less than 5 minutes, it will take a few minutes to tame and the taming efficiency won't go lower than 98% if you take care of it.

Also be sure and I mean 100% sure that you have AT LEAST 1 entire stack of biotoxin (500) or a bunch of stacks of narcotics (at least 1000) in the case of a high level giga. I personally prefer biotoxin, it's easy to farm if you have a good crossbow or pike, even a sword works pretty well.

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