I have added this FAQ for now, since many people ask this:
Is there a way for trading Pokémon Event Wonder Cards to other people around me or via Wi-Fi?
No, only the Japanese Secret Key (Rotom) and a Japanese PC Osaka Meowth event Wonder Cards can be shared with others; the rest can't. And you can only shared it if the person is close to you, not via Wi-fi.
So I can mix records for the event? (Oak's Letter)