It is not known to evolve into or from any other Pokémon.
Along with Raikou and Entei, it is one of the legendary beasts created by Ho-Oh after the burning of the Brass Tower. Of the three legendary beasts, Suicune is said to represent the rains that quenched the flames of the burning Brass Tower.
Suicune is a slim, quadruped, blue, mammalian Pokémon with white, diamond-shaped spots. Its face and underside are white as well. Suicune has a thick, purple mane that resembles the aurora borealis or a flowing river 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 that resembles the antlers of a Qilin with two prongs on either side of the base. It has red eyes, a protrusion under its chin, and small paws that have small white paw pads.
Suicune has the power to walk across water and purify dirty water with one touch. It will travel across grasslands in search of water to purify. Northern winds always seem to blow wherever it shows up. 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 shown to be heroic, serious, and calm during dangerous situations. It is also seen roaring from cliffs.
The first lengthy appearance of Suicune is in Celebi: Voice of the Forest. In the course of the movie, it demonstrated its ability to purify water, as well as doing battle with Dark Celebi.
Suicune, the Aurora Pokémon. It travels the world and purifies water wherever it goes, sailing on the North Wind.
In the manga
Suicune in Pokémon Adventures
In the Pokémon Adventures manga
Suicune was awakened by Yellow along with its two counterparts, and the three raced around Kanto and Johto looking for Trainers to help them defeat the Masked Man to free Ho-Oh. Suicune, in particular, personally challenges many of the Gym Leaders in the two regions. During its travels, it encounters both Eusine and Crystal, both of which become obsessed with capturing it. Eusine acquires the Crystal Bell from the Rocket trio he defeats, but he and Crystal are still unable to capture Suicune. Crystal has her confidence shattered by this (and by the guilt of interrupting Suicune's attempt to contact its old master) and has to retreat back to her old training grounds to regain her confidence, which she does by reacquiring her catching skills capturing a wild Larvitar. Suicune later chooses Misty as its partner and fights alongside her, but then pairs up with Crystal anyways after Misty becomes injured (much to the dismay of Eusine).
When released from a Poké Ball, Suicune unleashes a blast of Icy Wind that causes high levels of damage. Suicune returns in Brawl but with a different attack, Aurora Beam.
Melee trophy information
This mystical aurora Pokémon constantly journeys in search of places with pure flowing water. Suicune wields the power to instantly purify any contaminated water it finds. Some say Suicune is the north wind reborn. Its strange and dramatic story is told over the course of the Crystal version of the Pokémon game.
Brawl trophy information
"An Aurora Pokémon. It has the power to instantly purify even the filthiest water. Suicune is said to be the reincarnation of the northern wind, so when it shows up, so does that wind. Suicune uses the move Aurora Beam--aurora light focused into a powerful beam. Along with inflicting damage, this attack also lowers the target's attack power."
Game data
NPC appearances
Pokémon Crystal: It is possible to see Suicune multiple times on the overworld before the actual battle in Bell Tower. In these occasions, it will always hop away on being spotted.
Suicune embodies the compassion of a pure spring of water. It runs across the land with gracefulness. This Pokémon has the power to purify dirty water.
Suicune was the first Pokémon to receive its own unique battle music.
Origin
Suicune is thought to have been based on numerous creatures and mythological deities, mainly the Qilin or "Kirin", an Eastern legend that has traits of chinese dragons, unicorns, deer, big cats, and other beasts. The Qilin was said to be able to walk on water and is known to be a powerful and peaceful creature. The crest on Suicune's head roughly matches the description of the beast's antlers. It also appears that Suicune, unlike its kin, is a herbivore due to its molar teeth, which further relates it to the Qilin. The spots of Suicune are also significant, seeming to combine the spots of a leopard, taking homage from Fūjin, the Shinto god of The North Wind, who wears leopard skin. Leopards themselves are found in Asia and are featured in myths that show it is a widely respected sacred animal like the Qilin. The way it runs and roars in the anime may also relate to the leopard. Suicune's anatomy may also be based on the cheetah, which is considerable, due to the fact that cheetahs and leopards, both being swift, sleek spotted cats, are often confused with each other and thought to be the same animal. Being a Pokémon that represents the wind and rain, Suicune may also be based on some of the world's numerous myths of wind goddesses, such as Anitong Tabo, who according to the Philippine mythology, was the goddess of winds and rains. Suicune's mane is meant to resemble a northern aurora.
Name origin
Suicune may be a combination of 水 sui (water) and 君 kun (monarch). The game title it is the mascot of suggests that it may derive from 水晶 suishō (crystal).