Pokémon GO Trainers now have the chance to catch Ditto, a Pokémon with a curiously blobby shape and the capacity to mimic the looks and traits of other Pokémon. This means that a Pokémon you think you captured could be Ditto, which reveals its true form only after it’s caught. Also, when training or battling at a Gym, Ditto will copy the appearance, types, and moves of the first Pokémon it sees, and it will stay that way through the remainder of those Gym battles.
About Pokemon GO:
To learn more details about Pokémon GO, visit the official Niantic blog at PokemonGOlive.com.