Only thing I've ever heard to that effect is Pretendo, and it doesn't even appear to be working on the 3DS Pokemon games yet, much less anything on the DS. (Not that it purports to be working on DS compatibility at all.) They're doing God's work, but it is unfortunate that it seems the nature of what they're working on makes progress slow.
I wish I had something better to say, but I thought I'd at least air the bit about Pretendo in the possibility that you don't already know about it.
That's good there's someone working on it at least! Hopefully in the future it comes to something.