It'd be a ncie idea, but unfortunately the Pokedex enters the Pokemon even if you've only seen them;
Kind of annoying actually because the way the hack will turn out there will be no way of seeing whether you've took a photos of every Pokemon. :/
This is pretty much how it's going to be for the longest time though, seeing as I haven't been offered any graphical help and won't be making any myself till I've got the scripting done.