If you're carrying a tamed Doedicurus in your claw the Doedic will automatically start harvesting any stones you hover him over. Just start pumping points into your Doedic's weight because it will stop at about half of its own carry weight. I've yet to discover another tame it will work with though...
Guy best way to do it is with three people. 2 online 1 offline. One guy on the crab and 1 on a anky. The guy on the crab grapples the offline guy. Mine with the anky until the crab is heavy, then put all the metal in the offline guy. Rinse repeat until you cap out in metal on the offline guy. Head back to base and empty everything in the forges. Do this cycle for infinite metal on abberation. ( and if you want it to be faster. Have two anks instead of one. An a weight crab) best metal farming
Be careful when carrying a Dino that has a tribe mate mounted on it. I was walking up a hill carrying my anky with a tribe mate on it and they went under the map and died. RIP ANKY AND SHINEHORN. Tribemate was eh anyway.
No one seems to have mentioned that karkinos can use tools, they just need a special type of tool: doedicurus, use a karkinos to pick up a tamed armadillo and walk around to rocks and the armadillo hits the rocks and keeps them stored, argies and quetz can do it to but they can only hold one and they don't spawn on abberation, not sure but if you transfer a beaver to abberation you might be able to use it and an armadillo at the same time to gather both rock and wood