Sadly you can't, unless if there's a Rayquaza event coming soon.
How do you catch rayquaza in Pokemon black and white
No, you cannot get Rayquaza in Pokémon Black and Pokémon White except for via trading or migrating.
by action replay
You can only get a rayquaza by transferring it from heartgold or soulsilver or by the GTS.
Rayquaza can be taught HM02-Fly. In HeartGold and SoulSilver, Rayquaza learns Fly at level 45. In Black and White, Rayquaza learns Fly at level 65.
you cant catch rayquaza in Pokemon black
You can't catch Rayquaza in Black or White. You must transfer it from Diamond, Pearl, or Platinum.
Rayquaza cannot be caught in Black or White and needs to be transferred from an earlier version.
No. You have to either get it in HeartGold or SoulSilver or transfer it from Emerald.
You cannot get Rayquaza in Pokémon Black.
Rayquaza cannot be found in Pokémon White.
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.