Do one Battle Restaurant meal course at Restaurant Le Yeah and the Hotel Jobs(All 3), without changing clothes.

Wear a matching set of clothes as well and have the contact lens case, change your eye color real quick as well fo the above.

To get the lens case, simply go to the pokemon pr studio (the purple studio in Lumiose city) and do a shoot. Talk to the girl in the back near all the gear past the counters and she’ll simply hand one to you.

Took a bit to get but I hope this helped.

I’m trying to find the discount lady too but we might not have much luck in knowing where it is. If anyone knows, please share the spot!