Celio is a t ONE island he's the guy standing next to the trading machine at the Pokemon hospital
visit all the different islands and give celio the ruby and sapphire.
i think you can get timer balls on two island after you Complete Celio's Network Machine
Find the ruby inside mt ember give it to celio and he will let you go to islands 4-7.
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.
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.
in the dotted hole on island 6
find the ruby and give it to celio.
you can catch mewtwo at cerulean cave
yes
but before this, you must have defeated the elite 4
go to one island and talk to celio
Give it to celio in 1 island