For this guy I reccomend having an argy with lots of weight the two are an amazing pair and with the argy you can carry the anky to a safe location (such as an abandoned cave) so you don't have to worry about protecting it. On official I went through 20 narcotics and a few stacks of narcoberries on a lvl 50 so be prepared to wait a long time but in the end a 50% weight reduction on metal will be worth
1. Get tranq arrows and a crossbow
2. Find an anky of your desire
3. Shoot it in the head while walking backwards (they're slow so you can just walk while shooting)
4. When it runs away chase after it and shoot it
5. It'll be knocked out.
6. Feed it recommend food and any narcos if needed.
They get about 3x more metal than you! And depending on the level they can easily kill Raptors and other small predators.
They're found almost everywhere
Beaches, highlands, chalk hills, green forest, I've even see some near desert.