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>better version exclusives
Starmie > Cloyster
Pinsir < Heracross
Houndoom = Manectric
Mightyena > Liepard
Aggron < Tyranitar
Cradily > Omastar
Armaldo = Kabutops
Sawk < Throh
Slurpuff > Aromatisse
Clawitzer = Dragalge
Xerneas < Yveltal
Left is X, right is Y.
The megastones for version exclusives can only be found in the version that doesn't have the actual Pokemon, so Manectrite can only be found in X and Houndoomite only in Y. The villain's motive is also a little different but I don't remember in what way.
