Hi
If you posted anywhere else, it might be fine (for the initial few times), but you posted in user submitted news.
While you are unsure where it goes (is something I can understand), does what you're posting sound like news? XD
Did you even try XD
In any case I've shifted your post.
If you've already updated the game, and already saved once in the updated game, then you'll never be able to go back to a prior version.
If the game wasn't updated, you can go offline (to prevent updating), but you won't have access to the new Pokemons added.
I mean, that is the point of updating right, to gain access to the new content : x