So I went to buy a Lumiose Galette from the stand, and after I bought one, the lady said that I came during the middle of a special offer, and I got a free Moomoo Milk as a bonus. When/how often does this happen?
Ok so you can buy them from:
As long as you have 50 style points which you can get from doing certain things in lumiose city. Such as:
Giving a furfrou a haircut at Friseur Furfrou
Getting a haircut yourself at Coiffure clips
Making a Trainer PR video at the studio
Etc etc etc
Note: You only get a free moomoo milk once per day.