A black Rayquaza is a shiny so you'll have to be very lucky for the Rayquaza you find to be shiny.
you can't
It possible. Save before battling Rayquaza, then battle. if it isn't shiny[black] turn off the game. keep doing this until you find a shiny rayquaza[it is black]
no
a black rayquaza means that it is shiny. it is very rare but if you're lucky when you challange rayquaza, it will be shiny
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.
go to the last floor of sky pillar(you need a mach bike).save it and fight raquaza.if rayquaza don't shiny,reset your game until you get rayquaza shiny.
Talk To Rayquaza then you will battle it if its not shiny try again but I will worn you you have a 1/1000000.8 chance of finding a shiny Pokemon and for a shiny legendary 1/1000000000. So you willhave to try a lot my guesse 1 month or so. actually its about 1 in 8,700
Shiny Rayquaza cannot be caught on Pokémon Diamond unless you cheat.
trade
Every Pokémon has a 1 in 8,192 chance of being shiny. If you want to get a Shiny Rayquaza, save in front of it, start the battle, and soft reset (A +B + Start + Select) if Rayquaza is not shiny and repeat until it is. This could take days, weeks, months, or more, though. Even if you soft reset 8,192 times, it might not be shiny, but it could be after 10 tries. It's all a matter of luck.
no srry... i found my shiny requaza