User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-74.177.199.246-20121009185840/@comment-4212769-20121010074439

Later in the game: Gravios is first gen so Akantor won't use time travel to kill it in a previous game.

Later in the gen: The same occurs.

The right answer would be... Later in the series! Hooray! :D