Just think... That jerk that just sent you the umpteenth female Litleo now gets to sit there while that poor, ugly, clueless boulder goes through the last momentous occasion of its pathetic life, and you're already on your third WT messing with your next victim.
3DS Friend Code: 1719-3307-9497 PM me if you add me. Pokemon X Friend Safari: Bug type w/ Combee, Beautifly, and Pinsir!
Yep, Golem is pretty much useless other than being a PokÚdex entry, so you get the maximum enjoyment from sending them to all those inconsiderate children.
With his ridiculously low speed, he is probably ideal for trick room teams in lower tiers. Other than that, you are right.
My favorite Pokemon to send is modest Eevees. Mostly because I have over 5 boxes of them while in search of female Eevees (for the record I only got 4 female Eevees out of that entire ordeal, 3 of which had uselessly low IVs in sp attack). They have pretty decent IVs and would make a decent addition to any team. Most of them also have charm just in case someone wants a quick Sylveon. The only catch is they are all males.