I want to breed more Eevees on Pokemon Crystal but I accidentally already evolved it into Espeon. If I were to breed my Espeon with Ditto, would more Espeons come out of it or Eevee?
Breeding any Eeveelution with a Ditto will bring about a baby Eevee, so you can get more Eevee if you choose to do so.
Breeding any eeveelution gets you an eevee.
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