Because I know SOMEONE is going to ask.

This is a pokemon that has been found in the X and Y game code by a hacker. Its name is Diance and it is rumored to be a Rock/Fairy just like Carbink

I just want to say this out in the open… Rotom is NOT a legendary, nor will it ever be.
It's a rare Pokémon at the most, like how Zoroark was once Pokémon X, and you had to go through some special events for it.