You can't get Rayquaza in Ruby or Sapphire unless you trade it. you can, if you know the cloning glitch for Emerald, clone your Rayquaza and trade one to your Ruby Version.
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how to get raqueza in littletown in Pokemon ruby version
they are 2 different games.
Put 2 pikachu in the day care
trade 2 ruby/saphire
get the last 2