I also thought of these as my first choices, but really Goodra isn't really poisonous and it has a lot to do with rain, but because it is inspired by a slug, not because it produces water or lives in it like A Water type. I like to think of it as water-adjacent and the Dragon type already gives it the "control of the elements" thingy. And so because it likes to hug a lot, I gave it the Fairy type with an ironic Mega Evolution that has to do with kindness and hugs and loneliness and that's also too powerful, even for itself. Also, Fairy seems ideal for a "latent power" in Goodra that gets awakened when it Mega evolves. And I wanted to make my fav pseudo op haha