Try the official Nintendo website. Failing that try googl'ing the same question, or maybe even try Serebii, they have all the latest events pretty much as soon as they come out.
you can only get it in a Nintendo event
in a Nintendo event
through a Nintendo event
find a Nintendo event
You had to get it in a Nintendo event for D&P, then trade it over.
Action replay or Nintendo event. I used action replay because Nintendo doesn't give them out often.
you get deoxys on birth island. to get there, you must obtain a ticket to do this you must go to a Nintendo event which is a event where Nintendo give out stuff for your game.
Wherever Nintendo is at for said event
a Nintendo event is a real life event that you go to get a item for a game
Sometimes it depends what games your playing sometimes its a code or Nintendo event.
Genesect is an event only Pokemon, until Nintendo announces an event in your region there is no way to get one.
go to a Nintendo ds event cow