haha whoops im dumb. I guess Dark isn't actually too fitting (the full moon, in fact, is fairly bright) and psychic makes enough sense with the combined fact of its shared otherworldly nature + weird third eye thing with Solgaleo (another psychic type) and the fact that Pokémon really, really likes making most space Pokémon Psychic.
Alalon Exeggutor is a dragon type, but Gyarados is not. Drapion is dark/poison type, but not poison/bug type. What?!?!
ive spoke gyarados to death and even mentioned alola egg i think: alolan egg is a dragon palm. alolan egg is also really dumb and shouldn't be dragon anyway. Meanwhile, Skorupi actually is poison/bug. I guess when it evolves, the dark type part of it overpowers the bug. And reasonably so.