Ditto

Ditto is a normal type Pokémon that appears within Mystery Dungeon series.

Biography
Ditto is what’s known as the Transform Pokémon, being able to transform into other Pokémon and items. It is said to be made from the failed attempts at cloning Mew.

Red and Blue Rescue Team
Defeat a Ditto in either Frosty Forest, Fiery Field, Buried Relic, Wish Cave, Joyous Tower, or Oddity Cave. They will appear under the presence of a hidden item. You will need to have the Decrepit Lab unlocked in order to recruit them

Explores of Time, Darkness, and Sky
Recuit it in Sky Stairway.

Super Mystery Dungeon
Ditto is automatically recruited upon reaching Ace Rank