Yeah, maybe there isn't domination.
I think it's still worth exploring Spiritomb @ Mail to prevent trick though. Holding Mail, Spiritomb does not need to Shadow Sneak first move, meaning zam can't just Disable + Encore in the first two turns (it would be Disabling Faint Attack/Shadow Ball first turn and then encoring Shadow Sneak, which means Alakazam will faint on 3rd turn Shadow Sneak at worst).
But then without Expert Belt or Life Orb boosting offense and not using Shadow Sneak first turn to get a hit before Alakazam moves, Alakazam can survive 2 hits using screens or barrier, that opens up another bunch of options for Alakazam and Spiritomb...
I think it's still worth exploring Spiritomb @ Mail to prevent trick though. Holding Mail, Spiritomb does not need to Shadow Sneak first move, meaning zam can't just Disable + Encore in the first two turns (it would be Disabling Faint Attack/Shadow Ball first turn and then encoring Shadow Sneak, which means Alakazam will faint on 3rd turn Shadow Sneak at worst).
But then without Expert Belt or Life Orb boosting offense and not using Shadow Sneak first turn to get a hit before Alakazam moves, Alakazam can survive 2 hits using screens or barrier, that opens up another bunch of options for Alakazam and Spiritomb...