I've always hoped for a Pokémon MMORPG with all the content from the previous ones, but maybe it's to early for it
Another interesting thing can be the light type, yes; but it would be fantastic in my opinion to have an alignment of your Pokémon, that can be good or bad. So there can be Dark or Light versions of any Pokémon, with visual changes (ie: a Dark Dragonite could be thin and more aggressive looking), and different patches for the attack learning system...
But uhm, yeah...I started dreaming this in the GSC era or so