You cannot get Rayquaza in Pokémon Black.
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How do you catch rayquaza in Pokemon black and white
You can't get Rayquaza on Pokemon Pearl. You have to MIGRATE it
Rayquaza is in the movie Pokemon: Destiny Deoxys
Well, you can but it will take forever.. Anyways this is what you need to do: Go to Sky pillar, then when you get to Rayquaza "SAVE" then battle Rayquaza... If its not black then you need to turn off the game and turn it on again until it turns shiny. Every .9 pokemon are shiny, so this may take you 20,000 tries.
the black rayquaza is basically the shiny version of Rayquaza which is usually what you'll get. But if you get a shiny Ryquaza (black) that's pretty lucky.