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rain's the most common and most versatile. Steel's too good as it is, and with rain up some things just don't really have a weakness.
And if this isn't smogon rules you could just kick his ass with swift swim
sunny day always loses the rain wars, due to fire being weak to water, stealth rocks, and grass being weak to the fire attacks you've boosted on the other team.
Sandstorm's useable, but doesn't offer too much benefit besides residual damage. Rock type is just weak to too many things for the special defense boost to mean anything.
>look at those stats, I bet an eviolite nosepass would be invincible in a sandstorm
boy did that turn out terribly.
