Board Thread:Questions and Answers/@comment-33033861-20170920162409/@comment-32271305-20180311132918

You can go to the Wiki page of any character and click on the medals required, it will tell you in which event you can get them.

But I can confirm that those medals do appear in the Baba Shop sometimes, since they're Story Event medals and not Dokkan or Special Event medals. That's actually how I awakened my Vegeta, but unfortunately they don't appear very often.