Transform and Illusion

Question

If someone sends out a Zoroark, and it illusions a Pikachu, will ditto ransform in Pikachu or Zoroark?
Example:
Player 1 sent out Pikachu! (Really a Zoroark that's illusioning a Pikachu)
Player 2 sent out Ditto!
Ditto used Transform!

Now, will Ditto transform into Zoroark or Pikachu?
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Sorry if this was asked before, I couldn't find it.

Answer 1

It would fail... See? and if you don't think thats reliable then See here
>Transform will fail if used on a Pokémon behind a Substitute or a Pokémon under the effect of Illusion.

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Hope this helps :P