From Bulbapedia, the community-driven Pokémon encyclopedia.
The Ditto Egg group (Japanese: メタモン Metamon) is one of the fifteen Egg groups. It is the only group which has only one member.
As there is only one Pokémon in the Ditto Egg group, Pokémon in this group are all shapeless, purple blobs. However, they have the ability to breed with every member of every other Egg group but the "Undiscovered" and "Ditto" Egg groups.
Only in this Egg group
In this and another Egg group
- Pokémon in the Ditto group can breed with any Pokémon from any Egg group, excluding the Undiscovered Egg Group. However, Ditto cannot breed with members of its own group, meaning that Ditto cannot be hatched from an Egg. The only exception is in Generation II.
- Since this group consists of a single Pokémon, it is naturally the Egg group with the lowest number of types represented, with just one.