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Lunaala would either be one of these combos:
If Fairy:
Fairy/Psychic, Fairy/Ghost, Fairy/Rock, Fairy/Ice, Fairy/Dark
If Psychic:
Psychic/Ice, Psychic/Dark, Psychic/Rock, Psychic/Ghost
If Dark:
Dark/Ghost, Dark/Rock
If part Flying:
Psychic/Flying, Dark/Flying, or Ghost/Flying(the later seems more likely as the former two have been taken)
Im betting either Fairy/Psychic(moon moves are fairy and astral moves are psychic), Psychic/Rock(an astral pokemon with moon material) or Ghost/Flying(by aesthetics, it has a skeletal body and is a bat)