Just noticed something weird in the video above.
First thing, when the person entered the Mystery Gift menu there's an option "View Lock Capsule Card". Normally it should say "View Card Album" or somethig like that, but it shouldn't mention the card even if you only have one.
And then the wondercard looks different to how wondercards in gen 4 normally look like, there's even an icon of the item. Other item wondercards don't have that.
I connected to Wiimmfi to get the wondercard myself and noticed that it got saved behind the regular wondercard slots. Normally the last slot is at 0xAD0C, however the Lock Capsule would get downloaded to 0xB064!
Trying to place any other card at this location would result in something that still looks like a Lock Capsule card.
So, did GF really implement a special wondercard slot for an item that they never made available? Lol.
Was this ever mentioned somewhere? Or is it something that the Wiimmfi stuff figured out but never brought to the public?
And unfortunately I also can't figure out the flags needed to make the capsule work on BW, lost my HGSS cards ages ago and Download Play won't work on Flashcards either.
Edit: AR code for the above mentioned card.