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Talk to Giritina-man. If you trade him any old Pokemon that you caught on your own game, he can do magic to it and find your SID. If you're polite he gives you a flawless Ditto too for the trade.
Yep. The hoppip I'm trading you actually has perfect attack and speed so it's not too bad for some other breeding projects. I don't know if you'll ever need it though.