only if you transfer'it from the emerald version. use the vba link emulator for that if you play in your pc.
throw a master ball
Sky Pillar.
you cant you can only catch it in emerald but can trade it
You cannot catch rayquaza in fire red you must trade from either ruby or sapphire.
For Pokemon ruby you can catch the three regis, rayquaza, groudon, and latios/latias. In sapphire you can catch the three regis, rayquaza, kyogre, and latios/latias. However, in emerald you can catch kyogre, groudon, rayquaza, the three regis, and latios/latias.
nothing
Trade from emerald/ruby/sapphire.
Nowhere, because Rayquaza isn't in Gold at all. Rayquaza was introduced in the 3rd generation games, Ruby/Sapphire/Emerald.
you can catch kyogre,latias,rayquaza,deoxys(some say),
You need 7 badges and to have unlocked the 8th. Rayquaza is in Sky Pillar on Route 131.
Rayquaza is not in leafgreen, trade one from ruby, sapphire or emerald to leafgreen.You can't without an AR.
If you battled Rayquaza and defeated it, then it's gone. You only get 1 chance to catch a legendary Pokemon.