I was gonna say triple types... but then I decided, "What if X and Y was Gen 6 only with no backwards compatibility D:"
I'd be absolutely thrilled if backwards compatibility was omitted from Gen 6...
My suggestion: Give the fans what they want.
This would apparently include:
A light type Every single vaguely reptilian Pokemon replacing one of its types with Dragon Every Pokemon with wings getting Quiver Dance Everything you can slightly argue has a shell (Skarmory, Steelix, Metapod) getting Shell Smash Every Pokemon with a tail getting Tail Glow (I know what it means in Japanese, shut up) Every plant or vaguely plant-like or poisonous Pokemon getting Spore Ten difficulty levels An entire second version of the game in 2d so you can toggle between the graphics you want Six move slots Two abilities, with every Pokemon having half a dozen initial abilities and a blank slot you can put virtually any ability into Ash as the MC, as Ash, with Femme-Ash if you choose a female trainer Your playing the bad guys now and this game is about slavery, war and oppression Rated M for Mature Is now a 3DS based MMO ...and a 3D SRPG Includes two dozen new Pokemon which are really just Nintendo characters converted Gets regular patches online to update mechanics and tweak balance, all changes being voted on at Pokemon.com.