on island 1, in the pokecenter. u can get to island 1 by acheiving the rainbow pass
find the ruby and give it to celio.
If you mean Celio, his in one island pokemon center.
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.
you have to find the ruby in mt ember and bring it to celio but first you need the national pokedex--Check this answer out: http://wiki.answers.com/Q/How_do_you_unlock_islands_after_beating_the_elite_four
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.
Get the crystals on 1,2,3,4,5,6,7 islands and bring to Celio.
in the dotted hole on island 6
you can catch mewtwo at cerulean cave