Is it worth it to use a Pokemon who is only effective at walling one classification of attacks? My friend is telling me dedicated special walls, such as Blissey or and Chansey, and dedicated physical walls, such as Forrtress, Skarmory, and Gliscor, should not be used as they can be easily taken down by the other classification.
EDIT: This applies to both Gen IV and Gen V. How could Blissey not be good in Gen IV?
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