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You can get the mystery ticket in Pokemon Events. You can get the mystery ticket in Pokemon Events.
American games are limited to American events, Japanese games are limited to Japanese events. If the game is distributed through wireless (e.g.: GameStop event) any compatible game can use it.
So far, the only way to get Deoxys in Pokemon Platnum (or in any Pokemon game for that matter) has been through Nintendo events.
In real life. Serebii.Net will notify you when there is an event, no matter where in the world. There aren't any upcoming events yet though.
Pokemon events happen at random points in a year usually to coincide with a special release.