If I want to get a shiny Pokemon then I use the Action Replay/Game Shark and Cheats but if you can't get it or something then when you are about to battle Suicune then save before you do and start battling him then if he is not a shiny Pokemon then just keep on trying.
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Your Suicune in Pokemon SoulSilver glows blue when it isn't a shiny as a sign of rebellion.
In a wifi event but it's finished now.
It is almost impossible...but you can still do it. When you first get your Charmander, Suicune is released into the game. But you have to beat the Elite 4 and do all of the after game. After you have done all of that, you can go and catch Suicune. Run around until you encounter it. If it is not a shiny, then you have to reset your game and do it all over. As I said, it is nearly impossible. But if you reset your game enough times, you will eventually encounter one. Suicune remains the same no matter how many times you encounter it. Also, keep in mind that you have a 1/8192 chance of finding a shiny Pokémon. It could take YEARS to find a shiny Suicune in Fire Red. Hope this helps :)
they were in a event but the event has ended now.
It is already preset