From what I understand, a fake GTS/PokeCheck function for Gen VI is very unlikely. Not only are there difficulties in getting one to work, if Nintendo/GameFreak finds out, they'll patch up the exploit, just like that program you mentioned that checked egg contents. I forget what it was called, Instacheck or something.
Even though we're now without Distribution Carts, all WonderCards are still being extracted and posted here on PP. Which for pre-Gen VI events, you'd be able to inject those WonderCards in your game, as I was trying to do, but the difficulty was just an error on my part. But since the only way to do anything an Action Replay would for Gen VI is with a Japanese game cart, a Japanese 3DS, and a Japanese save editor called the "Cyber Gadget", it's not that easy. Even though we don't have a full equivalent of the AR for Gen VI in the West, in regards to WonderCards, Datel's "PowerSaves" is regularly updated with newly released WonderCards. So if you miss an event, you can still receive it if you buy a PowerSaves. You just can't add your own codes or do anything that they don't have an option for.
The thing is, Datel can give us full save editing ability like the Cyber Gadget and AR DS(i), they just choose not to. For what reason is beyond me.