If there's one thing Rose likes about Pokemon, it's that, for all their abilities, it's so very rare to find one that can resist instant death. And if you know Rose's preferred duelling style, there's nothing more to be said here. All it will take for the Dark Dragoon to walk away with this fight is to build up one turn's worth of Dragoon with her Demon's Dance combo, and then let the legendary gerbil have it with Demon's Gate. While Suicune's offense is quite good, Rose isn't so frail as to die in the solitary turn it can get before she takes dragoon form and flushes this watery menace right down the drain.