Release Date: October 1st - October 24th
Where to get it: Nintendo Network via Internet
Available in: Pokemon X/Y/Omega Ruby/Alpha Sapphire
While nothing about this Pokemon seems to suggest a Water/Fighting type, the Colt Pokemon, Keldeo, is an event-only Pokemon that is a bit of a rarity. The ability, Justified, helps increase Keldeo's attack whenever it is hit by a dark type move, so dark-type lovers beware! It also comes with the moves Aqua Jet, Leer, Double Kick, and Bubble Beam.
Getting Keldeo is as simple as a click on "Receive via Internet" while connected to any hotspot.