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Somnab (somnus + nab), the Dreamcatch Pokemon
Psychic
it is most active at nighttime where it silently floats above sleeping pokemon and people alike. It consumes only nightmares, allowing for a peaceful night's sleep for the 'victim'
Somnerie (somnus + something eerie), the Dream Master Pokemon
Psychic/Dark
The nightmares that it has collected in its previous stage, it can now selectively choose to give to its victims. It has the ability to give or take both nightmares and good dreams.