Suicune is a slim, quadrupedal, blue, mammalian Pokémon with white, diamond-shaped markings. Its face and underside are white as well. Suicune has a thick, purple mane that resembles the aurora borealis and two white, streamer-like tails that wave forward. It has a long, white snout. Suicune has a large, hexagonal, cerulean blue crest on its forehead with two prongs on either side of the base. It has red eyes, a small tuft of fur under its chin, and small paws with white paw pads.

Suicune has the power to walk across water and purify dirty water with one touch. It travels across grasslands in search of water to purify by following the north wind. Northern winds always seem to blow stronger in its presence. In Pokémon Crystal, Suicune is said to be the closest of the Legendary beasts to Ho-Oh. It is also said to have a link to the Unown. In the anime, Suicune is heroic, serious, and calm during dangerous situations. Suicune is believed to be both the embodiment of the north winds and compassion of pure spring waters.

(Source: Bulbapedia)