You can't. You can get Groundon. Also Rayquaza and one of the Lati-things, think its Latios on Ruby and Latias on Sapphire, but those are post Elite 4. You would have to play Silver, Gold, Crystal, Heartgold, or Soulsilver.
You can find lugia in navel rock
You can't.
you cannot catch lugia in ruby/sapphire/... you have to trade from fireRed, and leaf green. to get lugia you have to go to navel rock either in emerald, fire red, and leaf green
you need a game shark
you have to have action replay
Only with action replay
you get a lugia for your firered or leafgreen or ruby.
you don't.....you trade them......
Sorry but you can't catch it in ruby. You canonly catch it in diamond or pearl.
you cant. you have to migrate from soul silver or heat gold
you cant. you have to migrate from heat gold or sohl silver
how to find lugia and ho-oh