Ah, sorry I actually completely forgot about responding my bad.
Anyways, I did test. And unfortunately, none of them seem to work for me. I would doubt the Luma update will fix it, but you never know.
From what I was told, usually when a code doesn't work for a game, it means the code is either broken, or out of date. That means the games version is above the codes compatibility per-say. Some codes work with all versions, but not all. It seems like Y/X might've either had an update recently. Or even a while ago.
The codes would have had to work at some point in time, so I guess if you were to downgrade the version of the CIA, you could possibly use the cheats. However, why do that when you can use PKSM? Have you ever used PKSM? You can do everything you were trying to do, other than walk through walls. For free, and it also has other features. You'd have to check it out yourself.
Also, if you want to see what's behind the walls, it's nothing that interesting really. Just loads what you are supposed to see and the rest is just a blank void.