Japanese television show Oha Suta aired recently giving us some more insight into how events work in Pokemon Heart Gold/Soul Silver.
When players travel to Ilex Forest with Pikachu coloured Pichu (a movie event download) tagging along, Notch-eared Pichu will jump out from behind the shrine. An old man then comes out and explains things in more detail.
More information about Arceus has also been revealed. The Arceus given away at cinemas in Japan will unlock a new region called Shinto Ruins if traded to Pokemon Heart Gold/Soul Silver. However to unlock the region Arceus must first be brought along to the Ruins of Alph where Cynthia will be waiting.
The Unown will then gather around Arceus before an egg is made of either Dialga, Palkia or Giratina.
Hit the jump for the video of Oha Suta.