I've said this before. But, now that we have a new thread, I'll put the idea. What I think they should do is make it for the DS, but make it "3DS enhanced." When you play it on the 3DS, it would have more bonus features, and perhaps even access to more Pokemon. This would be similar to how Pokemon Yellow had enhanced graphics for GameBoy Color, but it was fully compatible with the regular GameBoy for those who didn't yet have a GameBoy Color. If they make Gray "3DS enhanced," it will appeal to both those who already got a 3DS, and those who only have a DS. Personally, I'll have a 3DS in probably a couple weeks, but I know how it is to not be able to afford the new system.