You can get the cheats from those from fire red xD
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You can find gameshark codes at Psypokes.www.psypokes.com/rby/ygameshark.php
ues Google to find answer
You cannot catch Celebi unless you are using cheat codes or waiting for Pokemon events.
It can be found found and downloaded on the internet which has cheat codes.
YOU CAN'T GET CELEBI IN DIAMOND WITOUT MIGRATING