Since Raikou is my favorite special sweeper, I'll recommend a Raikou-like set. The advantage of using Jirachi in this case is to continue sweeping even if Blissey or Snorlax appears.
[email protected]
-Calm Mind
-Substitute
-Thunderbolt
-Psychic
I don't have time for the EV spread, but basically you'll sub, calm mind a few times so special attacks can't break the sub, sub again once broken, sweep physical sweepers that can wreck you, continue to use calm mind, and sweep away. It's fairly simple once you gain the hang of it. I prefer Raikou, but if you need the Snorlax/Blissey coverage, go with Jirachi. Take care.
P.S. Be sure to give it max HP, so a seismic toss won't break the sub.