When you give him the ruby and sapphire gem.
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The elite four will open the door and they will become stronger than before. You can now trade with ruby, sapphire and emerald
Celio is the man standing right by the giant machine in the One Island Pokemon Center you can't miss him.
Celio is a t ONE island he's the guy standing next to the trading machine at the Pokemon hospital
i think you can get timer balls on two island after you Complete Celio's Network Machine
You must find the two gems and give them to Celio. The Ruby is found on One Island in Mt. Ember. For the Sapphire you must go to the Dotted Hole on Six Island and find it, but it will be stolen and you have to go to the Rocket Warehouse on Five Island and retrieve it.