You find it after you beat the main story of the game in the Final Maze in Marowak Dojo. Suicune appears on the 29th floor of the dungeon, but may be difficult to recruit as you cannot bring any items into the dungeon and if you fail, you have to start from the beginning to give it another shot, yeah, it's a jerk just like Jirachi,who appears on the 23rd floor.
yes in the final mase
darkrai ho-oh deoxys mewtwo zapdos latias latios entei raikou lugia jirachi moltres suicune
they are both level 30
the three islands
Go to northern field where suicune is at.
magic!!
Finish the whole Ho-Oh plot, then go to Suicune's dungeon and defeat it. 99.9% of the time it will ask to join your team
first entei then raiku then suicune
Sometimes there stands Pokemon next to the door of Spindas Cafe. Talk to it every day and you might get challenge letter for example from Suicune. After clearing the job it asks for joining team. For more info click link bellow.
In Pokemon Mystery Dungeon Red Rescue Team, you can beat/meet Suicune by having a Pikachu or Raichu on your team. You can get a Pikachu from Raikou's dungeon (I forgot what that dungeon was called), or have him as your partner at the beginning of the game. For more benefits, have your Pikachu learn Thunderbolt. Answered by: QWERTY
I think you should buy Pokemon Ranger because mystery dungeon is a little bit annoying and stupid Pokemon Ranger is amazing. I had so much fun playing it. I'm still trying to beat the part were you have to beat Raicu, Suicune, and Entei. It is SOOOO hard. I can beat Raicu and Suicune but never Entei!!!! :(. Anyways, I have never played mystery dungeon but my sister said she didn't like it sooooooo. Go with Ranger :)
According to the game, and bulbapedia, Suicune is gender less. However, in Pokemon mystery dungeon, it's a boy, yet most internet artists depict it as a girl. Hope this helps