If you are unsure if a rock is a disguised golem or not, a spyglass shows their name and level even when disguised. Also, when disguised, the rocks often move slightly as you get close, re settling onto the terrain.
Rock elementals are extremely tough to kill or knockout. Over encumbering them inside or around your base and setting them to aggressive allows them to defend your base with their rock throw attack without being kited away by enemies.
There is a great little natural passage that you can kite the golem in to at 64.1 - 49.9. We tame all our Golem there. They can't get out but once tamed can be moved out. It offers a great firing position for your cannon.
PRO TIP: on 2x taming weekends (Evolution Events) on official servers. You can knock out a level 20 or below elemental, slap some sulfur in it, and call it a day as it will not require narcotics on 2x but WILL still take 4 hours.
Build 5 stone dinosaurs gates and place them beside each other they should snap... now remove the middle and drag a Golem and lead it in the middle section.. now the Golem is stuck the paracer should be holding the cannon or any KO weapon face the cannon to the Golem and start shooting its head if the Golem is aggro on the stone gates go up to it until he losses aggro and focuses on you grab a shield so it will take less damage while it throws rocks at you the Golem can't run away because the two gates are holding him... hope this work make sure to carry extra ammo for the weapon if you miss the head
All rock elementals have the same rock skin when disguised. It is a bright yellow boulder and is very noticeable against dark mountains. Keep your distance, as they can aggro on to you when you get close.