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I have Pokemon Diamond and want to evolve my Graveler and Kadabra through trading but I don't know anyone with the game and Wi-fi will someone help me?
Well, for one, you find your code by checking your Pal Pad. They'll give you one the first time you get on Wi-Fi.
Second, you don't really need to to a tradeback to someone. All you need is the GTS to do so. In this thread, you'll find a guide on how to do so. So don't worry about it.