There will soon be an event to get it or you can transfer a 10th anniversery from a GBA game such as saphire, or Leaf Green.
celbi cannot be cached on Pokemon heart gold and soul silver to get celbi in gold and silver you haft to cheat sorry:( not god at English
hes not there
raikou, sucine, entel, mew, mewtwo, celbi, ho-oh, and lugia
you can't through normal game play
no you don't
you need a event.
No.
Hack of trade.
You can get the Celbi in Pokemon Nirvana by having Pikachu on the correct level and then you climb up the Cyrus tree. You will then see the Celbi in the tree.
I think there are some events but there are only in Japan I think, you can check Serebii.net but the only other way to get one is through an Action Replay Cheat System.
an event from new york.
you finish purity forest