Is Tornadus the only pure Flying type?

Question

Tornadus is the only single-type Pokémon that does not share its type with any other.

I saw this on Bulbapedia. I am pretty sure there are other pure Flying types. Is this an error on Bulbapedia, or am I going cuckoo?

Comments

Tornadus is the only PURE Flying-Type Pokémon, while anothers Flying Pokemons are Normal to!

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Yep. That's right.

Answer 1

This is not an error. All other Flying types have a second type (Besides Arceus, which is basically a Normal-type). For instance, Staraptor is Normal/Flying, while Tornadus is pure Flying.
I'm fairly certain that the reason for this is that using Roost takes away the Flying type, so all Pokemon (except Tornadus and Arceus, which can't learn Roost) were given a part Normal type so they didn't become typeless.

Hope I helped!