Under the assumption that there will be no more legendaries after Zapdos raids disappear, what will you use Golem for? If you are thinking about sending him to the Professor, think again.
You can use Golem as a super effective attacker against these Raid Bosses:
All other Pokemon it could hit for SE damage can hit back SE moves too (Cloyster – 2x, Lapras – 2x, Typhlosion – 2x, Ampharos and quite a few more). The only Pokemon it can counter is Salamence, which will push back with neutral damage. In the main game series, Salamence could get Hydro Pump through breeding, so this means that there is a slight chance it can hit Golem for 2x SE damage. With the base Attack, it can turn Golem into pebbles.
It could somehow work against Flaeron, Charizard and Jolteon, but there hasn’t been any single person that I’ve seen going for those raids.
Maybe it is over analyzing, but what is Golem’s purpose? There are still players who have barely beaten a Legendary Raid Boss because of the Golem army, but is it really worth it powering up Golem that much for the long run? Wouldn’t Tyranitar have been the better candidate to spend the Stardust on?
If there is something I am missing, feel free to debate on this topic. I would appreciate it!