The lower half of its body is wrapped in a cloud of energy. It zooms through the sky at 200 mph.
– Pokemon Black Pokedex
Tornadus is the first and only pure Flying Pokemon (not counting Arceus with Sky Plate, because Arceus counts as Normal type). It’s part of the kami legendary trio, exclusive to Black. It’s based on the god of wind, Fujin.
I always thought the thing around its body was a floating thing around its body, but looking at the 3D Pokedex (on the 3DS), it appears to be its tail that’s partially wrapped around is body. I think it’s a pretty ugly Pokemon, and I’m not a fan of its colouration, purple and green don’t make a good colour combination, and it doesn’t really speak “flying” to me. The kami trio, despite being Flying types, don’t have visible appendages for flight, they’re more levitating than flying.
Stat-wise, it has high Attack, Sp Attack, and Speed, but not as good defense.