Celio is a t ONE island he's the guy standing next to the trading machine at the Pokemon hospital
On Knot Island (the first of the Sevii Islands).
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.
one island
Find the ruby inside mt ember give it to celio and he will let you go to islands 4-7.
you must have beaten the game and caught at least 60 known species of Pokemon in your pokedex. then celio will ask u to get the ruby and sapphire for him. hope this helps.
I've got it, and i forget how you get it, but i think that you get it from Celio or Bill. Anyways, did you beat Blaine yet? when you get out of the gym in Cinnabar, Bill will come to you with a boat and ask you if you want to go to One Island, because for Celio. Say yes!!
give it to celio
You give it to Celio
Give it to Celio on one island.
he is in one island in the hospital.
You get a map from Celio, on one island.
If you mean Celio, his in one island pokemon center.
Get the crystals on 1,2,3,4,5,6,7 islands and bring to Celio.
in the dotted hole on island 6
find the ruby and give it to celio.
you can catch mewtwo at cerulean cave
go to one island and talk to celio
Give it to celio in 1 island