It depends on the Pokemon game you're playing. In the 4th generation and later games, you can re-encounter Suicune if you defeat the Elite Four again, while in earlier games, you won't be able to encounter it again.
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Suicune is not on Fire Red, Suicune is only found in Silver, Crystal and Gold versions. Suicune is one of the 3 Legendary Dogs, Entei, Suicune, and Raikou. Once killed the Legendary Dogs are gone forever, so it is important to capture them. They will be a great adaptation to your team.
yes but you have to beat the elite 4 and ash again
no, once you defeat any of the roaming legendary, they are gone for the game. WRONG! wrong, you can get Suicune i saw it if you defeat Suicune you can find it in the burned tower my friend showed 5 ppl and it is true. i could not believe it but its true. step one:if you defeat Suicune go to the burned tower. step two:solve the way step three: battle Suicune Its is the same with Entei and Raikou
suicune costume
Well technically, you can't KILL a Pokemon. You can just make it faint. When you make a legendary Pokemon faint, it will be gone until you start a new game.