Yes.
yes, once you get the national pokedex in Heart Gold you can then trade Pokemon from sinnoh
y-y-yes
no. Pokemon battle revolution can only take Pokemon from diamond/pearl
As a matter of fact you can. Heartgold and Soulsilver can interact with Diamond, Pearl, and Platinum the same way as they interact among themselves.
Use the wifi connectivity from your ds to your wii and you can battle with the Pokemon from Pokemon pearl, diamond, platinum, heartgold, and soulsilver versions
Pokemon platinum can interact with battle revolution in the same way as diamond and pearl
After Diamond and Pearl, there's Pokemon Platinum, HeartGold and SoulSilver, Battle Revolution, My Pokemon Ranch and then Pokemon Black and White.
The Battle Factory is unavailable in Diamond or Pearl, but it is in Platinum, Heartgold, and Soulsilver.
You have to import them from Pokémon Diamond/Pearl/Platinum/Heartgold/Soulsilver.
It is the newest Pokemon game, the first one on the Wii. You can interact with it and diamond/pearl.
in Pokemon white, black, platinum, heartgold, soulsilver, diamond, and pearl you do not need to battle anybody
You can only get pokemon if you have a diamond, pearl, heartgold, or soulsilver game. Otherwise you have to use a rental pass.
Technically,yes you can get Arceus in Pokemon Heartgold,but only by trading it to your Pokemon Heartgold game from Pokemon diamond,pearl or platinum.