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Lets look at the post games for each gens post game for a moment. To make it simple we'll only compare the first versions not the 3 versions also won't count catching all monsters and online since thats obvious.
Gen 1
>Mewtwo
Gen 2
>Stripped down Kanto+Mt.Silver
Gen 3
>Battle Tower and legedary hunting
Gen 4
>Battle Tower Legendary huntin Partner Quests
Gen 5
>White Forest/Black City Legendary hunting finding the sages
Gen 6
>Battle Tower Legendary hunting. (atm might be all though)
The first versions never have much. B/W had stuff but honestly I thought it was pretty boring and had the most fun with 4s post game. Its a little unfair that X/Y's postgame is being shitted on when its never very strong in the first version