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Swampert it slow man. Think about it when someone uses Curse they use it on slow Pokemon, (or with Aero and White Herb but that's silly) because they don't care about it's speed. Sometimes people set Speed to outrun other Curseing Perts so they can win the Cursewar but that doesn't really matter to me unless you're using CurseRoar Pert. xd
Also with Ice Beam you do around 30% to Zappy and he does around 90% to Pert with HP [Grass].
Anyway the point is Ice Beam Swapert is grand. If you don't think so odds are you suck. ^_^