Trap it with 4 metal gates and a large bear trap and light it up with tranqs or get into a confined space with ledges and light it up then or of your feeling cheeky then shoot it on a quetz. When it is knocked out unload all your narcotics onto it and wait until it reaches between 12-13K narcotic and then proceed to put all required narcotics in. This will make the torpor climb throughout the entire tame and if it's safe you can leave it until it needs feeding.

Don't underestimate these things they have a very high attack range and hitbox don't tame one unless you have enough resources and trapping it using metal Dino gates is the only way to go trust me I've lost a lot of Dinos trying to tame this thing ALWAYS BRING 3 TIMES MORE TRANQ ARROWS THN IT SAYS

Alright, here's an actual tip for mobile players. You need a tamed argentavis with a saddle on and a 10x soothing balm or that other soothing balm if you love wasting ambers, 4x metal dinosaur gateway, 1 trillion biotoxins for showing your giga who's boss by making it experience Odin sleep and around... 69420 raw prime meats, kibbles are fine, but why tho? Also SET YOUR ARGENTAVIS TO PASSIVE.

For the weapons preparation, i suggest speedrunning the volcano cave, artifact of the massive so you can atleast obtain a high dmg ascendant crossbow, and you need around 100 million tranq arrows or if you're rich, Ascendant Longneck Rifle also with 1 million tranq darts

Gigas usually spawn in mountainous regions like the top of griffin mountain in north zone, snowy mountains and the highest point pursuit mountain , you can spend 100000 hours trying to find a high level one in medium-hard difficulty, I recommend tidy saving and save data on the game BEFORE the thing spawns, so if you end up getting low levels you can restore save data making it BEFORE you encountered the low lv Giga, who knows the RNG swaps your low level with high level Gigas?

Now in my experience Gigas ignores tamed creatures in MOBILE unless provoked so you can get yourself as close as possible with your tamed cargo birb as long as you don't attack it.

Now this is the "Pacifist" way to tame a Giga, i'd say..

-Time consuming 8.5/10, make it 9/10

-Danger Level: 2/10 (as long as you don't be a bob attacking the giga)

-Effectiveness: 6/10

-Resources Needed: Mid (ignore the ridicolous numbers, you need alot to knock one out and keep it asleep okay? So bring as many tranqs and biotoxins)

Once you've found your desired Giga, roam around it like National Geographic Camera-man, make a documentary of the Giga, follow the Giga, watch it murder anything in its way, be happy, be traumatized, be consumed with fear UNTIL the Giga finally walk itself into a FLAT location, now once this happens, you look its sorrounding, any victim for the giga? If there is, just keep watching the Giga murder them until theres none. Now your Giga is standing still, no more victims left, here's what you gotta do, land with your argentavis, and plant your 4 METAL dinosaur gateways WHILE RIDING your Argentavis, Lock the Giga in like a square of Metal Dinosaur Gateways. If it fails and Giga got distracted by more victims to murder, just destroy the gates and rebuild since Argentavis have smithy saddles. Repeat another 1000 times hoping it doesn't despawn until you successfully trap the Giga in your gates. Once trapped, your life becomes 1000x easier. Now place a bed near the Giga so you can respawn near if somehow killed.

If you dont understand what i mean by square gates, heres a diagram, (i hope it looks good once posted)

____

[ 🦖 ] ⬅️ 🔫🚶‍♂️ 🦅

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See that? Yeah, that's what it means. Gate, gate, gate and gate, until Giga can't escape. Why metal?? Because dude can't bite metal.

Giga trapped? Now start blasting all those darts, arrows, whatever, at it in a distance to avoid being a victim of the Murder machine. Keep blasting, dont bother checking Torpor with spyglass, just keep shooting like those good ol days you're running away from Satan Tickle Chicken, keep shooting and shooting and shooting with your tranqs until it fell down and knocked out.

Waste no time, run into the Giga, and use your soothing balm, force feed all that 69420 raw prime meats to your Giga and show em who's boss by forcing it to an Odin sleep with Bio Toxins until it's tamed.

Congrats, you tamed a murder machine. Now their hp dropped to 17,000 from 80,000 and just pray that their melee damage is near 100% so you don't have to spend eternity lvling up its melee before it starts hitting hard.

Now what do you do? You tame another one, breed them and raise families of Gigas until one of them is 100% imprinted and mutated, now you can murder anything in your way.

Side note: ONLY LEVEL UP GIGA'S MELEE DAMAGE

Giga? Obtained. Casualties? None, other than the 1 billion souls of the damned the Giga murdered when it's wild. Resources? Nothing much other than a couple metal gateways, biotoxins and tranqs. Either good luck or good food, for the Giga's stomach

Realistically, we all know the most effective way to deal with a giga is to kill it. They are easily one of the most difficult tames in the game just based on consumed resources, and they straight up aren't worth taming unless you plan to super breed them. So, instead I submit you this idea. Make a standard Plinger Phoo giga trap,but lined all along the bottom with metal spike walls. If done correctly, you can lure the giga in and let it die on the spikes. Also useful for clearing out unwanted dinos without wasting bullets or ammo. Just lure into the death trap.