@asmonet: No, charizard would also be weak against electric and rock types, if not a couple of others. Ice, if I recall, is neither weak nor strong against it because of his dual type of fire/flying.
I can’t think of any pokemon that are weak only to water or ice type. But if you’re making a team based on Sunny Day, why would you use a water or ice type? Any attacks of those type would be weakened during the duration of Sunny Day.
Hey, anyone seen my dignity anywhere? I’m pretty sure I dropped it on Fluther somewhere. :P