Sadly the anky does not have the ability to swing at rocks when held by an argy in Ark ultimate mobile edition(though for some reason the doed does have it). But they are still very good for gathering metal and other stuff! One way í do it is bro grabbing the anky with my argy, or just putting it in a cryopod. Then, I go to a metal-rich rock and manually gather the metal. It is still quite the same thing and it will still guarantee a ton of metal. Hope this tip helped!!