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It looks like it would be quite toxic, but really, it's just phosphorescent. Regular Altarias are definitely creatures of the day, but this nocturnal variant helps guide people through dark, moonless nights. (Basically, still adorable as fuck.)
Still Dragon/Flying, but gains a few choice new moves in Tail Glow, Dazzling Gleam, Moonblast, and Moonlight. I wonder if that would make Altaria almost useful.