You need to buy a cloud map for 20 credits for Rayquaza
You can't find rayquaza in pokemon platinum.
You can find Rayquaza in map 13.
You have to trade Kyogre from Pokemon Sapphire, and you must trade Rayquaza from Pokemon Emerald.
Rayquaza can be found in Blackthorn City where Clair is.
You can't get Kyogre in Pokemon Ruby but you can get Kyogre in Pokemon emerald and sapphire and in ruby you only get groudon and rayquaza. In sapphire you get Kyogre and rayquaza and in emerald you can get groudon, Kyogre, and Rayquaza.
go on Pokemon crater
yes you have to find all of the seven to catch rayquaza in pokemon white
in your house
Pokemonbattlearena.net
by the mountain
you can't
you can rarely find larvitar.