You cannot catch Celebi in Pokemon Diamond.
In Diamond,Pearl and Platinum, You can not obtain Celibi unless... ... You go to a special event. Go to Pokemon.com to see updates on upcoming events!
gts or transfer
What you can catch in Pokemon diamond without migrating it are legendaries are... Dialga, Azelf, Uxie, Mesprit, Heatran, Giratina, Cesselia, Regigigas, Rotom, and Celibi. Really you can find Celibi in Solaeon Ruins but it is EXTREMALY rare. A once in a lifetime and it will flee as soon as possible.
Migrate it(Nationaldex needed)First you will need Emerald.Then catch celibi on Emarald and then migrate using palpark.
You can't other wise you have to trade from Pokemon Collosium
you get celibi
unfortunately you dont you have to trade it from diamond or pearl
the cheat for celibi in Pokemon diamond is 2ggrf3ff g3445566 hfggy5760 that's the cheat if it doesent work go to any other website
you haft to get past the pokemon leage first then you haft to get a pass from mystery gift and a pokemon boat appears.you get on it and there is a island.you haft to have a all the moves to get there.youcan then battle celibi
you can get celibi on heartgold only from a wi-fi event
You cannot catch Celebi in Pokémon XD. You Can Catch Celebi Only If You Trade From The GBA System
yes, you can catch Pokemon in Pokemon diamond