Are you sure you have the right version of cheat codes for the game version? If you have a European game you need the European cheats and same for the US and Japanese versions.
There is not a known Darkrai Action Replay Code for Pokemon HeartGold and SoulSilver yet.
With an action replay.
buy it!....
action replay
you press action replay codes on Pokemon soul silver
action replay or trade
Pokemon SoulSilver is by far better. The action replay only works with games. If you do not have a game (i.e. SoulSilver), then it cannot work.
Yes it does. On Action replay DSi it does have Pokemon Soul Silver, but on Action Replay DS it doesn't.
No.
on eBay
Yes, yes it does.
buy it at the store