what about a Mono-Attacker set for both Physical and Special?
Special Mono-Attacker:
Spiritomb@Leftovers
nature: Bold
evs: 252 HP / 252 Def / 4 SAtk
move 1: Rest
move 2: Sleep Talk
move 3: Calm Mind
move 4: Dark Pulse
Physical Mono-Attacker:
Spiritomb@Leftovers
nature: Adamant
evs: 252 Atk / 252 HP / 4 Spe
move 1: Rest
move 2: Sleep Talk
move 3: Taunt
move 4: Sucker Punch