Does anyone know if your items in the Treasure Chest and all the berries in your garden stay after the October maintenance? I have some stat increasing berries there and I don't want to lose them, but if I transfer them now and it turns out that you don't lose the berries, I won't be able to propagate the berries anymore...
That's actually a really good question; I went and checked with The Pokemon Company International today about the (possible) issue, and this is what they had to say:
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Dear Earendil,
A solution for your issue has been suggested.
Hello Earendil,
thank you for contacting the Pokémon Support.
Please note that our support team cannot make any statements about the future of the Pokémon Global Link. All currently available info can be found here:
http://www.pokemon.com/us/pokemon-news/pgl_xyrelaunch-2013-07-01/
http://en.pokemon-gl.com/about/s_notice/
We will release more information and details the closer we get to the launch of the new Pokémon Global Link and the release of Pokémon X and Y.
Thank you for your understanding.
Sincerely,
The Pokémon Support Team
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So there you have it, then- they won't say, which probably isn't a good sign (and the above letter came to me straight from the Global Link customer service center). If I were you, I'd pull everything but a "skeleton crew" of berries from your Treasure Chest. Leave only a few of each (just enough to plant a row of each type when the Dream World reopens on October 12th), and import the rest to your game, where at least you know they won't vanish. Plus the element of time is so critical here that you'll always want to plant the seeds of as diverse a crop as possible- if you only concentrate on replicating only one type of berry, your access to all the others will be extremely limited after December 10th.