The Mythical Pokémon was first seen in Pokémon Black Version and Pokémon White Version in Ordinary Form, and then after learning the Secret Sword move in Pokémon Black 2 and Pokémon White 2 could change into its majestic Resolute Form.
The Mythical Pokémon is a Water and Fighting-type, will be Level 100 with the Justified ability, and has the moves Aqua Jet, Leer, Double Kick, and Bubble Beam.
Keldeo will be available until 24th October 2016, so make sure that you grab it in time!
How To Download Keldeo From The Nintendo Network
1. Select Mystery Gift on the main menu
2. Select Receive Gift, then Yes
3. Select Get Via Internet, then Yes
4. Watch as you receive Keldeo
5. Speak to the delivery girl in any Pokémon Center to receive Keldeo
6. Be sure to save your game!