It is probably because you have not updated your Action Replay with the two new games: Pokemon Black and White.
NOTE: If you have the Action Replay DS, consider switching to the Action Replay DSi.
You must connect your Action Replay with your computer and go to their main website.
Every Pokemon from every region except Unova
no
This works for Diamond and Pearl Just Do The RareCandy Cheat and Give a Ton of Rare Except For Platinum
yes
There is no code for that, unfortuneatly.
A Pokedex cheat
Every single Pokemon except ones with no gender and legendaries.
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Yes there is but you need an action replay.
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get a freind to trade them to you
Use the Action replay.