Quote Originally Posted by MV75 View Post
I'm currently on 6 badges, just gotten to the snow city up north, and using the method on the site you linked, I got oaks letter just fine.

So yea, I think that when you have access to the producer guy in jubilife you should be fine to get the gift.
AS long as you can get to the TV producer and tell him the correct words before the Oaks letter promo ends you'll be fine.

Once you have oaks letter, and after you defeat the Elite 4, you can proceed to get Shaymin at any time.