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I drew up a quick sketch based on an idea that I had
Nopossum (Normal)
The Shy Pokemon
Ability: Rattled
Upon reaching level 25 and having its ability activated in battle it will evolve into:
Zopossum (Normal/Ghost)
The fake body Pokemon
Ability: Mummy
Learns "play dead" upon evolution
It is a priority move that nullifies damage and gives the user 50% of the damage it would have received as HP. It cannot be used consecutively.
The pokemon isn't dead, but its "soul" gains ethereal properties and can hang out outside of the tail and let the body take damage.