...Hmm
So how about this
> EXP Share now optional, you receive it from Alexa only if you talk to her yourself in Lumiose City, game's overall level curve adjusts to this so it assumes you don't use it throughout the story, but you can if you still desired
> Lysandre will now try to awaken Yveltal and Xerneas, but trying to become immortal with Xerneas's powers and trying to cause so much destruction with Yveltal's powers causes a great disturbance in the ecosystem, Zygarde awakens and has some sort of new form, possibly Mega
> Lysandre will see Mega Evolution as the next step of Pokemon, they are not beautiful and are incomplete if they are not Mega, he appreciates their destructive power and they wouldn't be able to defeat an immortal being. He'll have a full team, and will somehow find a way to have 6 Megas
> Yveltal is encountered on Route 13 during the postgame, Xerneas is encountered on Route 20
> Friends become fleshed out and more helpful. They all have actual teams with full movesets, all of them will hang out in Kiloude City postgame, you can face them all at once (healing in between like a Restaurant battle) or just individually, can also decide what type of battles they will be
> You can contact each of your friends with the Holo Caster
> Shauna checks your Pokemon's happiness
> Tierno will go in depth about a move any of your Pokemon has
> Trevor will tell you about rare Pokemon that can show up in routes
> Serena/Calem will tell you about your team's type matchups and abilities.
> You'll also be able to contact Professor Sycamore for a PokeDex analysis from anywhere
> Gym Leaders, E4, & Champion's aces will have Megas
> Coumarine City now has a ship that'll take you to the Battle Frontier, only this time there's a new attraction at the back... The Pokemon World Tournament
> The Kalos Leaders now have a tournament meanwhile Iris and Diantha join the Champion tournament
