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Ditto, it's the Swiss-Army Knife of Pokemon.
Here's a short list of what you can do with it:
-Breed animals with it
-Bring back extinct animals
-Have it turn into a weapon
-Have is disguise you
-Have it spy on people and once it comes back it can do a little morph video
-If you want to be creepy you can have it replace people
-[spoilers]Or you can just screw it