I like Staraptor, but Empoleon's my favourite. I like the way it sounds like it's piercing the air, very high-pitched towards the end. Another favourite is Shellos, it sounds just like squelching mud, which obviously has something to do with the fact that it's a slug pokémon. I often used to catch loads of Shellos in diamond, then repeatedly go up and down the menu so that you'd here their cry constantly, one after the other. Anyway...I mustn't forget Espeon! Such a lovely, silky puurr....