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Remainder that looking like the moon doesn't make you a Fairy. Moonblast is just as comparable to Solarbeam if anything. In nature, plants are reliant on the sun for their growth. Since nothing in nature is heavily realiant on the moon, Fairies would easily cover the moon part for being magical creatures. Its the reason why the Clefairy line get STAB on this move for doing dancing rituals on the full moon all the time. You also see rabbit-like pokemon with this typing (Wigglytuff, Megearna, etc.) as rabbits were associated with the moon in folklore.