It seems that I've finally been able to get into the shop, but the prices are incredibly expensive.
There was a woman who mentioned being able to get a discount card, but no mention of how to get one.
How do I get a discount card for the shop?
How to get a Coupon for the Lumiose City Boutique
pokemon-x-y
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Best Answer
The Discount Coupon was available via Global Link until March 3, 2014 (thanks to @Jerry for finding that one out). If you got it until then, it will remain on your game until you use it or delete the save file.
For reference, here is a description of how it was done, which might apply to similar future events:
To get it, you simply need to create an account on 3ds.pokemon-gl.com, log in, register your game (use the in-game Game Sync feature to create a Game Sync ID) and click the right picture in the PokeMileage Club. The next time you use Game Sync, you will receive a Discount Coupon from the red Lady right of the PC in any Pokemon Center. You also get a confirmation on the PGL site once you've unlocked it.