To get the ruby in Firered, the one you have to give to Celio, go to Mount Ember near One Island. At the entrance, move to the right slightly and you will see two Rocket Grunts, you must defeat the Pokemon League to confront the two grunts. Once you defeat both of them, they will flee. Then enter the cave that they were blocking before and navigate your way through the small number of rooms until you find the ruby.
in firered
No.
There are none in Pokemon Ruby trade from FireRed or LeafGreen.
It is in Saphire, Ruby, and Emerald not Firered.
No, but i believe there is in ruby
there is only one ruby.
Sapphire and Ruby came out before firered and leafgreen but they are compatible with them.
Not any hoenn Pokemon but firered and leafgreen can catch alot of kanto and johto Pokemon ruby and sapphire can and can't.
you don't get a second ruby you get a sapphire
it is on the mt ember
give it to celio
Gastly is unobtainable in Pokemon Ruby. You need to trade one from Pokemon Firered or Leafgreen.