Go on higher ground such as on mountain, and place a metal foundation and a cannon lower the cannon aim at the head, fire in between rock throws, and Dodge incoming rock. Note, once rock animation starts that is location of rock being thrown. Happy hunting
It's a bit silly that kibble tames it a lot better than rocks or sulfur because even in the dossier it says that it lives off of absorbing nearby rocks and minerals. So mabey they should make it so you have to feed them a rare mineral like obsidian what if they made it so you could tame one fast and with high effectiveness by giving one a few hundred or few thousand obsidian . or what if there kibble was made out of a combination of ores and minerals .