Pokemon X Y WalkthroughPokemon XY PokedexPokemon Wii U
Pokemon X and Y: Version Exclusives
Note: The Charizardnite and Mewtwonite stones that are version exclusives can be traded. Therefore, the different forms of Mega Charizard and Mega Mewtwo can be used in both versions.

X Exclusives:
Mega Charizard X
Staryu
Starmie
Pinsir
Mega Mewtwo X
Houndour
Houndoom
Poochyena
Mightyena
Aron
Lairon
Aggron
Sawk
Swirlix
Slurpuff
Clauncher
Clawitzer
Xerneas
Y Exclusives:
Mega Charizard Y
Shellder
Cloyster
Mega Mewtwo Y
Heracross
Larvitar
Pupitar
Tyranitar
Electrike
Manectric
Purrloin
Liepard
Throh
Spritzee
Aromatisse
Skrelp
Dragalge
Yveltal