Great lists, guys. I certainly respect the Xatu choice- there are so many Pokemon that look super cool but lack in the power department. However, every Pokemon serves their use, which is why (excluding my two "rule of cool" choices, Lugia and Charizard), my top two favorite Pokemon are:
Granbull- I am a pug owner. While Snubbull is the more adorable of the two puggish Pokemon, Granbull is scrappy and has awesome defensive typing, coupled with high HP and Defense. You can even repurpose Granbull into a solid physical attacker with his impressive bulk, unreliable-yet-potent Play Rough, and a slew of other physical attacks not normally found in Fairy types. Altering his type in X and Y is possibly the greatest thing that could have happened to Granbull, as he is now a threat to a number of other offensive types and soaks up Dragon hits. A new lease on life solidified this pink powerhouse on my team.
Zoroark- I'll admit, I love foxes, too. Vulpix was one of my most sought-after Pokemon in the Red and Blue days, but its fire typing and low utility crippled its use. However, upon first seeing Zoroark, I was in love. A dark fox with wicked claws and offensive typing that allow it surprising viability, the most delightful aspect of this Pokemon has to be its ability, Illusion. IT'S SO COOL. I love playing mind games with other trainers (who expects an Abomasnow to suddenly spew Flamethrower?!), and because of its speed, Zoroark often gets a leg-up on opponents with its varied moveset, keeping them guessing. Although it's a more recent Pokemon, it's positioned itself high on my list because of its unique attributes.