While Cresselia easily compares to Milotic for its beauty, which is one thing I like about it, I'd really choose Darkrai here. I just find Darkrai to be a really cool Pokémon, and even though its design could've been better, it's alright. I also like its backstory, as well as the role it played in the 10th movie, being hated by everyone for something it wasn't even able to control, which was really a different story to what I initially thought about it.