in birth island
You go to birth island
you have to get a gameshark and go to island 9 to get it
you get deoxeys in fire red by this code MYSTERY GIFT
I'm sorry but it is impossible without a cheating device or an impromptu Nintendo Event
you can try a website called loombo you can watch any movie on it like destiny dyoxys the power of one Pokemon 4ever Pokemon ranger and the temple of the sea you can also watch stuff like dispacble me
The Pokemon that you can catch are: Rayquazza-sky piller after helping aqua and magma groudon- land lair kygore- Sea lair latias/latios- watch tv or mix records with ruby/Sapphire Lugia/Ho-oh- event Pokemon Dyoxys- event Pokemon mew- event Pokemon