in any version you need a masterball
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Raikou, Entei, Suicune, Ho-oh, Lugia and Celebi.
no
you dont have to catch suicune but if you want to have ho oh i sujest you do plus it learns aura beam wich is good against lance
The most important pokemon to catch in any game is its mascot, in this case Suicune.
You could get a shiny Pokemon for crystal but you need luck to catch one ("_")