Give it to celio in the one island Pokemon center he will give you a rainbow pass which allows you to access islands 4-7.
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.
give it to celio
it is on the mt ember
you don't get a second ruby you get a sapphire
Not any hoenn Pokemon but firered and leafgreen can catch alot of kanto and johto Pokemon ruby and sapphire can and can't.
Gastly is unobtainable in Pokemon Ruby. You need to trade one from Pokemon Firered or Leafgreen.