I'm happy to say that ditto is in pokemon go! He can be found in any pokemon, as he is a transformation pokemon. But, he is mostly found in pidgys, zubats, ratatta, and majicarps. After catching a pokemon, it might say oh! Instead of (pokemon) was caught, a screen comes up and a ditto appears, and then says, ditto was caught. Ditto has many cool abilities. I still have yet to find him. Good luck on your pokemon journey!