yes
You give it to Celio
Give it to celio in 1 island
FireRed. If Ruby, Sapphire, and emerald you must have Ruby and Sapphire gem and give it to celio in one island
You can do this after you find the Ruby and the Sapphire for Celio in Pokemon FireRed. then you can trade with Ruby, Sapphire and Emerald.
visit all the different islands and give celio the ruby and sapphire.
Did you deliver the ruby and sapphire yet to celio if not you need to before you can face the elite four.
you need to go to one island and go in the Pokemon net center and talk to celio
Connecting to Emerald as the same conditions as to Ruby and Sapphire. You must have completed the 7 Islands (Giving Celio the Ruby and Sapphire).
You must locate the scientist who stole the sapphire in dotted hole then defeat him in a battle he will give you the sapphire back now take that to celio and now you can trade with ruby and sapphire and emerald.
He will put both gems in the network machine which when operational will allow you to trade between ruby, sapphire, emerald, colosseum and xd gale of darkness.
but before this, you must have defeated the elite 4
Yes and it needs to be finished as in it needs to have beaten the elite four and has the national dex and has delivered the ruby and sapphire to celio.