In ancient legends and the Bible we obviously know something about Dragons breathing fire. There's even a full essay about it on a wiki here. In relation to Pokemon, there are quite a lot of Dragon-types that can learn Flamethrower, examples being Druddigon, the Dragonite family and the Salamence family. So out of the 40 dragons in the Pokemon world, why is Reshiram the only Dragon/Fire type Pokemon?