Pokemon: A question about Ditto?

I know when Ditto Transforms, it adopts the Pokemon's stats as well, but I have a question? After transformation, will IV's, EV's, and Nature affect the new stats, or will Ditto's stats match the Opponent's Pokemon ( Excluding HP of Course )? I am trying to decide if I should run Ditto or... show more I know when Ditto Transforms, it adopts the Pokemon's stats as well, but I have a question? After transformation, will IV's, EV's, and Nature affect the new stats, or will Ditto's stats match the Opponent's Pokemon ( Excluding HP of Course )?

I am trying to decide if I should run Ditto or Hydreigon with Choice Scarf for my B&W Sandstorm Team.
Update: This is referring to a DW Ditto with Eccentric.
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