Question: what are ditto disguised as?
Answer: Although Ditto was missing from the original release of Pokémon Go Gen I, Ditto eventually found its way into the world, hiding as Pidgy, Rattata, Zubat, and Magikarp. With Gen II, Ditto also learned to hide as Sentra, Yanma, and Hoothoot, and Gen III as Zigzagoon and Taillow.