I wonder if they are against it because it could create controversy with the whole Japanese whale and dolphin killing thing. That's a pretty heavy topic right there. But we have Wailord, so I don't see why not. In my opinion though, a dolphin Pokemon would be hard to get right. I see it turning out looking very weird, but I'd embrace it if they got it right. On the Ninfia topic, I'm putting my money on it being flying. That looks a hell of a lot like Skyla and I could see it becoming her signature Pokemon.