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I always wanted a Normal/Ghost type pokemon that could change forms: its base form would be like a generic skeleton and it would be a speedy attacker with No Guard (think marshadow's stat spread) but you could give it a blanket and it would change forms into a generic ghost with Magic Guard (think 120 HP/Def/SpD and 80 Atk/SpA/Spd)
That is my dream.
Also the blanket would be a key item so you could still give it leftovers or something