On 1 Island, he's standing next to the trading machine inside of the Pokemon center.
find the ruby and give it to celio.
If you mean Celio, his in one island pokemon center.
Find the Ruby inside Mt ember and then give it to Celio.
one island
give it to celio
You give it to Celio
on island 1, in the pokecenter. u can get to island 1 by acheiving the rainbow pass
if u havent then you could catch mewtwo, or nothing at all or whatever u wish
Deliver it to celio and now you can trade with sapphire or ruby version. To trade with emerald you need two wireless adapters. Also after that finish the pokedex oh and try the trainer tower.
he is in one island in the hospital.
Give it to Celio on one island.
You get a map from Celio, on one island.