Method includes two ppl. Get golem stuck behind 2 rocks in a V shape or close to it. Have the non-tamer hold the aggro while out of range of explosions while still in range of golem aggro. Non-tamer must be on flying dino. Have tamer behind non-tamer and use rockets.
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 .