*blows out smoke on gun*
Anyway, yeah I'm with R_N on the retro mode. That would be a massive waste of resources for something that so few people would enjoy. Just think of all the additional sprites, sounds, textures and everything they'd have to put in. It would take so much time out of the production that could be put forward to doing much better things like adding gym leader rematches, extra locations to explore, post-game activities and the like.
Games require time and money to make remember.