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I haven't seen confirmation of this for sure, and the phrasing of the archived stuff is fairly ambiguously phrased. Do you get to keep the Lucario you use for the Mega evolution demo, or is it just a once-off? If you do keep it, could you SR for natures? Can you change the name, or does it have the same rules as a trade? And can you actually catch wild Riolu or Lucario, or can you only use this one (if you do get to keep it)?