You cannot battle Giovanni in Pokemon HeartGold and SoulSilver through normal game play. The eighth gym is run by Blue, not Giovanni, in these Pokemon versions.
However, if you obtained a Celebi via a Nintendo Wi-Fi event (which has long since passed) and go to the Celebi Shrine in the Ilex Forest, the Celebi will take you through time, and you will eventually battle Giovanni.
Pokemon Heartgold and Soulsilver are the remakes of the old Pokemon Gold, Silver, and Crystal series. Pokemon Heartgold and Soulsilver are for the Nintendo DS.
No, there are no underwater routes in Pokemon HeartGold or SoulSilver. The HM Dive is not available in Pokemon HeartGold or SoulSilver.
You don't. He's not there. Only in HeartGold and SoulSilver with the Celebi event.
he is not in Pokemon soulsilver or Pokemon heartgold
SOulsilver
That is impossible in Pokemon HeartGold and SoulSilver.
You can only go to Johto and Kanto in Pokemon Heartgold and Soulsilver
The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
Pokemon Soulsilver and Heartgold cost about 35 to 40 dollars on the US
The Quick claw is located in the National Park in Pokemon Heartgold and Soulsilver.
You can't. You need to get Heatran from Pokemon Diamond, Pearl and Platinum and then trade to heartgold and soulsilver.
Suicune is at Level 40 in HeartGold and SoulSilver.