>>43762717Dragon type never had any real identity. It was a type that was made for a narrative purpose rather than a gameplay ones. Notice how all of the type of it resists (Grass, Fire, Water, and Electric) are the starter types.
It was made exclusively to make Lance more challenging. Once the type outlived its original purpose, they naturally started giving it to more Pokemon and eventually nerfed it down to the level of the rest of the types.