Keldeo

Keldeo is a quadrupedal, colt-like Pokémon with a cream-colored body. It has a short, rounded snout with large nostrils and blue eyes. It has a large, feathery red mane, long, dark blue, ridged eyebrow-like protrusions, and a single cream-colored horn that curves slightly. The back of its head, as well as its neck, is covered with fluffy, light blue fur. Keldeo has blue hooves, which are capable of ejecting water. Its tail is light blue with white spots and resembles an elaborate feather in a cap.

Upon learning Secret Sword, Keldeo transforms into its Resolute Form. The dark blue protrusions become shorter and lighter in color, resembling ears. Its horn becomes dark blue and grows larger and ridged. On the side of its head are three feathers colored aqua blue, green, and orange.

Keldeo was trained by the other members of the Swords of Justice. Keldeo tends to cross the world and often appears at beautiful watersides. Keldeo also travels in order to further improve itself through training. It can walk across the water by ejecting water from its hooves. It is said Keldeo must endure harsh battles in order for the forehead horn to develop, which then its true power will be awakened.

It is thought that when Keldeo becomes resolute, its body fills with power and it becomes swifter. The horn on its forehead is filled with hidden power. The horn can change into a sword that can cut through anything.

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 Keldeo. They acted as its parents, and they 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.

When the four meet again, they teach Keldeo the move Secret Sword.