>>45657670No, most dedicated physical/special walls want at least passable defenses on the other end of the spectrum so they can avoid autolosing to surprise mixed coverage.
If you're just talking raw stats, Eviolite Chansey still has higher special bulk with zero special defensive investment than Nihilego does with a Calm nature and maxed out special defense, even during Sandstorm. Add on reliable recovery and there's no contest.