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Aron and its evolutionary line which includes Lairon as well as Aggron.There were a few Pokemon that were version exclusive during the main story but were also obtainable in the Friend Safari regardless of which game the player had. In Pokemon X and Y version exclusive Pokemon are found in a couple of different ways: Pokemon that can only be obtained in a specified version of the game ( X or Y) or Fossil Pokemon available in a specified version.
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This is a trend that has been seen in every generation of Pokemon and continues even into Gen 8 and its Isle of Armor and Crown Tundra expansions. As is with its predecessors this was primarily accomplished through the Pokemon that are available in each game.
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Pokemon introduced a lot with Gen 6 and like every installment in the series it made Pokemon X and Y different enough that it could be noticed but overall, they were the same.
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