How to merge new download

So I downloaded the new 1.2.5 on a windows device, and now I need help on how to merge it with my current 1.2.3 save file. I have over 800 hours clocked on this thing and I really don’t want to lose all my pokes due to a mistake. So, what do I do?

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Open your save in 1.2.3,save in a PokeMall,then open it in 1.2.5.

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Do I have to unzip the 1.2.5 download patch?

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Yes.

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