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scratch that, I read your original post again. trade a pokemon with the same original trainer as your missing cart to your flashkart. every pokemon stores the ID and hidden ID of its original trainer. For example, in this black white save I opened up a Purrloin originally owned by Charlie. I can see his ID and hidden ID. Now I just need to change the ID of ユウ to match and I can steal all of Charlie's shit out of pokemon ranch.