You can't, seeing as it is a fifth generation pokemon, and they haven't come out with the fifth generation games yet.
NO no NO no NO no you can get him on black and white
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There's no Action Replay code for Zoroark in Pokemon HeartGold, because Zoroark does not exist in Pokemon HeartGold.
You cannot trade a Pokemon from the 5th generation to the 4th generation or below. Getting Pokemon from Black/White to HG/SS is impossible. You can migrate Pokemon from HG/SS to Black/White though.
You can find it in Pokemon Platinum, Pokemon Crystal, Pokemon HeartGold, and Pokemon SoulSilver.
You can only find Skarmory in the Pokemon SoulSilver version.
Meowth are Pokemon SoulSilver-exclusive Pokemon. In SoulSilver, they can be found on Routes 5-8, 38 and 39.