yes you can but you have to have the friend code
mine is SAM 4039 8578 6544
Yes you do need a friend code to battle on wifi
Everyone who has connected to Nintendo wifi connection before has a friend code.
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yes at supercheats.com/pokemon heartgold action replay codes
You trade Pokemon from Pokemon Heartgold and Soulsilver to Pokemon Diamond by going to the wifi room in the Pokemon center on the top floor. You also need to have a copy of Pokemon Diamond and have to have a friend or someone who has a copy of Pokemon Heartgold or Soulsilver. You will see someone there if you are going to trade with someone. Talk to the person you are going to trade with and ask them if they want to trade. The top floor is the Union Room no Friend Code needed the basement is the Wi-fi room, which requires a Friend codes
you have to go to pokemonheartgoldcheats.piczo.com
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i dont bloody know
No
yes there is:-)
There are no in-game codes for any of the core Pokemon games.