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Ditto OP
Now that the attacks are so much slower, ditto has become way more usable.
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I could see Ditto being used for things like Machamp, Alakazam or Gengar with assuming the defender has great moves so you can use Ditto, swap out to save the evolution (for Blissey), and go back to one of your traditional attackers and once you get to Blissey, use the Machamp that was at the gym (with counter/new fight move) and take out the Blissey if you didn't have one...
Still pretty unlikely to use since you're more likely to never see those at the gym (at least not level 10 towers).