Batman is so smart he would only have one Pokemon and then scientifically change their DNA to any Pokemon he wants. Then he would make a clone of them.
Thus, he has every Pokemon ever created.
...That made sense.
...so ditto... Or ditto's rarely known about cousin, idiott. Eh? See what I did there? Idiott is actually a genetically enhanced burrito, but if you played gen wun you'd know that. You dins it under the truck.
Official Mirror admin with meh trusty shadow scyther. We will rule, and when we do, I will claim the world's gummy bears