I have a suggestion so here it goes. The Blk Medallion adds 20% of chance on finding hidden ability but what if there's a Medallion that will add or boost the chance of sync so instead of leaning on 50% chance it will give 80% chance of working. I came up with this idea after catching epic cloyster but sync fail lol 

-1 for me , bad idea , i think 50% is resonable ,

Hello, if balancing wasn't a problem then maybe it would have been an option but I'd rather add a mood in the trainer card where you can select your current mood such as Bashful, Timid or Modest and then you could synchronize with your mood once you activated the Sync Medalion instead of a Pokemon.

 

Sadly balancing is a problem therefore I doubt this will happen. :c