My favorite Pokémon was Gengar growing up and in hs my best friends favorite was Darkrai. I haven't spoken to him since he graduated. I was two years younger. He introduced to gen 4 and I played it on desmume on his phone during lunch and before classes. He also introduced me to the Darkrai movie.
As I've gotten older my favorite Pokémon slowly drifted towards Darkrai. Now I can say confidently My favorite is Darkrai.