(SKETCH) I always found Keldeo to be the odd one out when it comes to Pokémon. Not only a does it have an in-game backstory, (which already makes is one of the two only to do so) But it also had parents, which implies that it not only came from an entire SPEICES of Keldeo, but presumably it's the last of it's kind. Here's a sketch of a young Keldeo and one of it's aforementioned parents