no there isn't
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yes you can get shiny Pokemon with action replay
There is no Action Replay code that automatically gives you all the Pokemon.
theres no action replay code for dilga in any Pokemon game
There's no Action Replay code for Zoroark in Pokemon HeartGold, because Zoroark does not exist in Pokemon HeartGold.
There is not a known Darkrai Action Replay Code for Pokemon HeartGold and SoulSilver yet.