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Is Diamond Mine Country the Backpackers region? The one that gives you the strange souvenir.
"Clearer images of CoroCoro have been posted to Japanese forums and this batch showcases more information about Diancie. Specifically, it reveals that Diancie's ability is Clear Body, and states that it can learn moves like Hyper Beam & Explosion, and showcases the new movie poster featuring Diancie with details saying that the movie is "A grand adventure with the princess of the Diamond Mine Country". Not much else is known at this time".
My theory is the Diance distribution event will give us a Couriway train ticket which takes the player to Diamond Mine Country.
Sounds very reasonable..