According to the pedia, Roost changes Flying to Normal type, so it's no longer an issue. It's impossible for
Tornadus to learn Roost, so that issue is pretty much moot, but I don't think that's the reason why they waited so long to finally have a pure Flying type, especially since Roost only came in with the 4th generation. I don't know if it was speculation or not, but I think something said that no pure Flying type existed because there was nothing that they could think of what would be in the sky constantly. (in other words, it would never have to land) This idea falls apart for some of the Water/Flyings, except that they can also swim. I then ran into
Drifloon/
Drifblim and realized that stuff with the power to levitate makes that idea fall apart. I suppose it could be said that some things may not always be able to use their mind to levitate, but it seems to be in the nature of Ghost types to be able to levitate, and with no effort at all. Of course, it would come to be that Levitate would be an ability separate from Flying, but still able to grant immunity to Ground. So I guess they consider levitation to be a separate power from Flying, which in their context, I may agree. What about Tornadus that makes this possible, then? That it's based off the kami of Japanese legend? I'm not sure.
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