first get a mirage sensitive Pokemon caught randomly in the wild then go to pacifidlog town and in the bottom right house an old man will tell you that he sees mirage island then surf to the right from there and youll see an island with a tower you climb up and at the top youll find rayquaza you also need the mach bike
from the sky pillar, surf north east of pacifilog. (you need a mach bike to get past the falling floors)
ruby=groudon+raquaza+latios+the regis sapphire=kyogre+raquaza+latias+the regis emerald=raquaza+groudon+kyogre+latios or latias+the regis
raquaza is a master legendary Pokemon in emerald ruby and Sapphire. his is most likely to be the best Pokemon in the series (Case in point)
Only Groundon can be found in the game, but you can trade Kyrogue and Raquaza from the other games.
I only know Regi rock,regi ice,regi stell and raquaza
Their is groudon,latios,regirock,regice,and registeel,and raquaza. and then there is also latias if you have the Eon Ticket which you receive from special Nintendo events. so that's a total of seven legendary Pokemon that you can get in Pokemon ruby.
Sadly, no. The creators of the game forgot to add in the Pokedex, so trading is impossible without GameShark. :(
no, trade it from emerald
I dont think you can get Rayquaza in Ruby.....only in Emerald
raquaza
yues he is :3
Raquaza (sorry if I mispeled that)
that's it i think