Virderian forest or something like that
It is pichu, the baby form of pikachu.
i wan to know too
As far as I know, you can't get a Celebi on Heart Gold. But if you want to know, there is currently an event going on if you put a Celebi on Heart Gold and go to Ilex forest, a spiky eared Pichu will come out from behind the shrine.
For shiny Pichu, it is a Nintendo event on Wi-Fi or it is sometimes given away at events. To get 'Notched-Ear Pichu', as it is known, you need the shiny Pichu from a Nintendo WFC event. Once you have that go to Ilex Forest and go to Celebi's shrine. If you have the shiny Pichu with you then spiky eared Pichu will be there. Hope this helps!
Ok so here it is! Heart Gold: Oddish,Growlithe,JigglyPuff,Pichu,Marril. Soul Silver: Lickitong,Oddish,Staru,Vulpix/growlithe,pichu.
use the poke radar in platinum,diamond,or pearl in the trophy garden and trade in to heart gold or soul silver
bring a Celebi over to heart gold. go to a forest (there are only two) and talk to a man. he gives it to you.
If you have platinum and live in England the current wi-fi event (Untill 25th march 2010) is the pikachu coloured pichu. Trade this over to heart gold/soul silver and then you can find it. Hope this helps!
You cant get it in Pokemon platinum only in the new Pokemon heart gold and soul silver edition.
Celebi is an event pokemon, in Gold and Silver (including their remakes) You need the GS ball for the original Gold and Silver to find it. In the Heart Gold and Soul Silver, you need a Pikachu coloured Pichu (not shiny)