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.
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You cannot get Rayquaza in Pokémon Black.
How do you catch rayquaza in Pokemon black and white
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.
You get RAYQUAZA at the top of SKY PILLAR after seeing GROUDON, KYORGE and RAYQUAZA in SOOTOPILIS CITY. RAYQUAZA is LV.70 so be prepared! RAYQUAZA knows these techniques: EXTREMESPEED REST FLY DRAGON CLAW. The ratio of it being shiny is 25%. The only difference between SHINY & NON-SHINY is that the SHINY one is BLACK, not the regular GREEN. The best ball to use on RAYQUAZA is either an ULTRA-BALL (Or if you are lazy and not bothered a MASTER-BALL!)
No, Rayquaza cannot breed.