Here's how you can easily tame one in a cheap and fast way if you don't care about taming efficiency: first tame a doedicurus. Then find a gacha and gather, with the doedicirus, all the nearby rocks you find. Disable auto harvesting (you don't want it hitting your gacha by mistake while it tries to farm more stone.) and set it to follow you. Transfer one stack from the doed's inventory to yours (100 stone), and then drop it. Transfer another stack right away. Once it starts eating (and the dropped stack disappears.), drop another one. Repeat it until tamed.