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Skarmory is to set up entry hazards, cause status conditions, and be a physical wall.
Electivire is one of three mixed sweepers on my team, and i can bait the electric attack to set up a motor drive using either Suicune or Skarmory.
252 Sp. Atk
Azelf is another one of the mixed sweepers.
240 Sp. Atk
Salamence is the third mixed sweeper on my team.
4 Sp. Def
This is just the classic "calmcune" that I'll use to either calm mind until my stats are maxed and then sweep the rest of their team, or if im facing a bulky water, I'll just pressure stall out all their moves and let them KO themselves from struggle recoil.
I understand that there are some repeat items, but I just transfered them over from my Pearl version.
That aside, it's not a bad team, but it's lacking in key areas.
The big problem has got to be synergy. You're running three defensive Pokemon (Suicune is being counted here, but obviously it poses a threat sweeping) and three offensive Pokemon, and while this type of arrangement can work, they don't really support each other well.
This team has potential offensively, so I would make your defensive Pokemon support your sweepers better. Skarmory is a misfit really--Metagross is a much more effective Stealth Rock lead that has more power and can beat Taunt + SR leads like Aerodactyl and Azelf.
Electivire actually isn't a bad fit here, but you'll want to alter the set. It really wants Cross Chop/Thunderbolt/Flamethrower/Hidden Power [Ice/Grass]. Ice fits better here since Swampert has trouble with a lot of your team, but if you can't get HP Ice, just use Ice Punch. But Cross Chop over Earthquake is important to beat Blissey, Snorlax, Tyranitar, and weakened Heatran.
Cresselia with Rest and no Aromatherapy support is really asking for trouble. Moonlight is unreliable but at least Cresselia can defend itself.