Keldeo (Japanese: ケルディオ Kerudio) is a Water/Fighting-type Mythical Pokémon introduced in Generation V. Keldeo is a member of the Swords of Justice, along with Virizion, Cobalion, and Terrakion.
Keldeo resembles a foal or small unicorn referring to the horn on its head. It is mainly pale yellow in color with light blue fur covering its neck and the back of its head. Its tail is also light blue in color. It has long, dark blue eyebrows and a red mane. Its body is somewhat slender and it has a rather fat yet well-toned rump. On the ends of its legs, has dark blue hooves.
Keldeo's dark blue eyebrows turn into smaller light blue eyebrows, and its horn is now bigger and dark blue. On its mane it now has three feathers, matching the colors for the others in the trio, green, orange, and blue.
Long ago, a fire started in the Moor of Icirrus because of a war among people. In this fire Keldeo was separated from its parents, but together Cobalion, Terrakion and Virizion took care of it. They acted as its parents and taught it knowledge and moves for survival. Keldeo eventually grew and even surpassed the three Pokémon. One day, Keldeo took off from the forest with no one knowing why.
Pokémon The Movie - Kyurem vs. the Sword of Justice
While still in training with The Swords of Justice, Keldeo was convinced that he was ready to face Kyurem in order to become a Sword of Justice, but Cobalion refused. Disobeying its mentors, Keldeo walked off to the mines of Full Court where Kyurem resided and called it out for a battle, claiming to be a Sword of Justice. When it attacked the dragon, it was completely outmatched and had his horn sliced off by Shadow Claw. The battle also resulted in the freezing of the Swords of Justice, causing Keldeo to flee in fear and Kyurem to pursue the Colt Pokémon in order to finish the battle they had started.
Keldeo, weakened from the one-sided battle with Kyurem, managed to jump down a cliff onto a train, which happened to have Ash, Iris and Cilan riding in it. Although he did not trust them at first, he eventually became friends when Ash and co. saved the Colt Pokémon from Kyurem and its Cryogonal posse. Keldeo then healed up and regained its strength. He told the gang about who he was, and how he aspired to be a Sword of Justice, like its mentors.
Kyurem attacked Keldeo several times, the latter narrowly escaping each time. Ultimately, the battle led back to where the two battled originally, and where Keldeo entered its Resolute Forme, also learning Secret Sword in the process. Keldeo quickly gained the upper hand with improved agility and a combo of Double Team and Focus Blast, but ultimately lost when trying to protect his thawed out masters and friends from a Freeze Shock, with the electrical element causing even more damage. Despite his loss, Keldeo's valor earned it Kyurem's respect, who said it was better to lose a battle than to lose one's friends.
- Keldeo is the second Water/Fighting type, the first being Poliwrath.
- Keldeo is the second Mythical Pokémon to be available without the need of an event, after Deoxys.
- In Super Smash Bros. Keldeo is one of the Pokémon that can be freed from Poké Balls. During this time, it uses the move Secret Sword.
- As BW are made during the last days of NDS, NDS' system had been completely hacked and leaked Pokemon no. 647~649 earlier than the offcials did.