Got #73 today, this is the ex raid gym right next to #71. I was able to put my mon before Party Hat Wobbuffet raid and got a 98% regular from the raid. After several hours and berry feeding it turned gold.
This is the third gold gym that I did not battle in at all, only by raiding and putting my mon there. Total time defended in this gym is less than 4 days. This is a challenge I gave to myself.