I had a similar experience but with a decently large group, some battles with 60+ people. But like you said, not everyone wanted to do Eternatus and wanted to do gmax instead. There was a lot of Are we doing anything but Eternatus? I didnt bother helping with gmax, I have mine and dont care about IVs. They still had plenty to do those so I didnt feel guilty. Hopefully the next Eternatus event itll be just him so theres no issue like that again. There was complaining afterwards though, specifically because people thought Eternatus was a boring fight. No catch, no shiny hunt, just candy and thats not what this game is supposed to be about.