Full Moon Version:
Said to live in another world, this Pokémon devours light, drawing the moonless dark veil of night over the brightness of day.
– Pokemon Moon Pokédex
Lunala is really flat. It also reminds me of Olympia, the Psychic gym leader of XY.
Not sure if Psychic/Ghost is a good type combination, having two 4x weaknesses and only 2 resistances (and 2 immunities I suppose, but all Ghost types do)