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I keep saying I'm done, then I keep having a new idea.
Heres Gravistack - Psychic/Flying (Zero G form)/ Psychic/Normal (normal) - This pokemon is proud of it's looks as it gracefully floats about, using it's masterful control of gravity. It's thanks to this gravity control that it's able to keep up this appearance, as without it, it's true form is revealed.
Gravistack's true form is the result of it's weaker structure being exposed to gravity. When in this state, it drops it's mystical demeaner and becomes upset as though it's trying to convince anyone who sees it that it's still a tall and slender being.