You also find the sapphire and give them both to Celio.
no
If you trade Pokemon between leafgreen and ruby ruby will have your leafgreen Pokemon and leafgreen will have the ruby Pokemon both in the party they will not be sent to the PC unless you personally walk to the PC and do so.
to get the ruby yes you do
There are none in Pokemon Ruby trade from FireRed or LeafGreen.
Sapphire and Ruby came out before firered and leafgreen but they are compatible with them.
You cannot catch Registeel in Pokemon LeafGreen. This is due to FireRed and LeafGreen being able to trade with Ruby and Sapphire. Pokemon Ruby and Sapphire have the three legendary golem Pokemon including Registeel.
No.sorry.
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.
You can only get The Red Orb, (or "Ruby"), in Pokemon Ruby, and I think Sapphire, (correct me if I'm wrong!).
Impossible. But, you can trade from firered/leafgreen to ruby, or red to gold.
Trade dratini from firered or leafgreen to ruby.