Also, I don't understand Illusion (or Encourage for that matter). If it copies the second Pokemon in the party, but Jigglypuff would be the first Pokemon (using Serebii's example), then why would Zoroark copy Jigglypuff? I'm confused @_@.
Because if Jigglypuff is your lead and you switch into Zoroark, Jigglypuff becomes your second Pokémon.
...!
And to your opponent's eyes, WHICH WAS THE REAL JIGGLYPUFF??