I am open to any and all suggestions, changes, etc.
My team at a glance:
In Depth:

Swampert @Leftovers
Torrent
EVs: 252 HP/4 Atk/252 Def
Impish
-Stealth Rock
-Earthquake
-Waterfall/Ice Punch/Ice Beam
-Protect
My lead that sets up rocks and can scout for choice sets and Explosions. I chose Swampert because I could use another Physical attacker on the team, and I could also use SR. My team is also Mixape weak, and if they don't carry Grass Knot, this can counter it. Waterfall for STAB, Ice Punch for coverage, or Ice Beam for Salamence (intimidate)?

Starmie @Leftovers
Natural Cure
EVs: 136 HP/156 Def/218 Spd
Timid
-Surf
-Ice Beam
-Rapid Spin
-Recover
My Spinner that can switch into entry hazards and absorb them, thanks to Recover, Lefties, and Natural Cure. EVed to make it bulky, but still fast and able to hit decently hard.

Metagross @Choice Band
Clear Body
EVs: 252 HP/238 Atk/12 Def/8 Spd
Adamant
-Meteor Mash
-Earthquake
-Bullet Punch
-Explosion
Physical sweeper with a choice band. Meteor Mash for STAB, EQ for coverage, and Bullet Punch for a priority move. Explosion when running low on health or when I need to take out a pesky pokemon and the loss (of Metagross) won't hurt me much.

Porygon-Z @Life Orb/Choice Scarf
Adaptability/Download
EVs: 4 Def/252 SpAtk/252 Spd
Timid
-Tri-Attack
-Dark Pulse
-Hidden Power [Fighting]
-Nasty Plot/Ice Beam/Thunderbolt/Psychic/Hyper Beam
Nasty plot special sweeper. I'm iffy about this one. I like the idea of having power to absolutely destroy stuff, but he's slow for a sweeper without a scarf. Life Orb is very helpful to me as I do not predict very well, and I can switch moves as they switch in thinking I have a choice item. Normal, Dark, and Fighting provide perfect coverage, and Pory is very frail, so I was thinking of dropping Nasty Plot altogether, and using TBolt, Ice Beam, Psychic, or even using Hyper Beam as a make-shift Explosion, (due to the re-charge turn) and with Adaptability it will hurt a lot on anything.

Skarmory @Leftovers
Keen Eye
EVs: 252 HP/64 Atk/178 Def/16 Spd
Impish
-Brave Bird
-Roost
-Spikes
-Whirlwind
Physical wall that sets up entry hazards. EVed so it can hurt stuff with Brave Bird, and it can roost off the recoil damage since it won't be doing too much damage. Spikes are very helpful if I can get 3 layers down. Whirlwind to pHaze, or escape a Magnezone trying to set up (otherwise I would be dead by the time Skarm could use it).

Blissey @Leftovers
Natural Cure
EVs: 252 Def/40 SpAtk/218 SpDef
Bold/Calm
-Aromatherapy/Heal Bell
-Ice Beam
-Softboiled
-Thunder Wave
Special wall that is EVed to be able to take a physical hit or two. Aromatherapy or Heal Bell (it doesn't matter which) heals the team's status ailments. Softboiled to stay alive and TWave to cripple sweepers. Which nature do you suggest I use? More Def or SpDef?
Again, I am open to any suggestions.
Changes in Bold.
My team at a glance:






In Depth:

Swampert @Leftovers
Torrent
EVs: 252 HP/4 Atk/252 Def
Impish
-Stealth Rock
-Earthquake
-Waterfall/Ice Punch/Ice Beam
-Protect
My lead that sets up rocks and can scout for choice sets and Explosions. I chose Swampert because I could use another Physical attacker on the team, and I could also use SR. My team is also Mixape weak, and if they don't carry Grass Knot, this can counter it. Waterfall for STAB, Ice Punch for coverage, or Ice Beam for Salamence (intimidate)?

Starmie @Leftovers
Natural Cure
EVs: 136 HP/156 Def/218 Spd
Timid
-Surf
-Ice Beam
-Rapid Spin
-Recover
My Spinner that can switch into entry hazards and absorb them, thanks to Recover, Lefties, and Natural Cure. EVed to make it bulky, but still fast and able to hit decently hard.

Metagross @Choice Band
Clear Body
EVs: 252 HP/238 Atk/12 Def/8 Spd
Adamant
-Meteor Mash
-Earthquake
-Bullet Punch
-Explosion
Physical sweeper with a choice band. Meteor Mash for STAB, EQ for coverage, and Bullet Punch for a priority move. Explosion when running low on health or when I need to take out a pesky pokemon and the loss (of Metagross) won't hurt me much.

Porygon-Z @Life Orb/Choice Scarf
Adaptability/Download
EVs: 4 Def/252 SpAtk/252 Spd
Timid
-Tri-Attack
-Dark Pulse
-Hidden Power [Fighting]
-Nasty Plot/Ice Beam/Thunderbolt/Psychic/Hyper Beam
Nasty plot special sweeper. I'm iffy about this one. I like the idea of having power to absolutely destroy stuff, but he's slow for a sweeper without a scarf. Life Orb is very helpful to me as I do not predict very well, and I can switch moves as they switch in thinking I have a choice item. Normal, Dark, and Fighting provide perfect coverage, and Pory is very frail, so I was thinking of dropping Nasty Plot altogether, and using TBolt, Ice Beam, Psychic, or even using Hyper Beam as a make-shift Explosion, (due to the re-charge turn) and with Adaptability it will hurt a lot on anything.

Skarmory @Leftovers
Keen Eye
EVs: 252 HP/64 Atk/178 Def/16 Spd
Impish
-Brave Bird
-Roost
-Spikes
-Whirlwind
Physical wall that sets up entry hazards. EVed so it can hurt stuff with Brave Bird, and it can roost off the recoil damage since it won't be doing too much damage. Spikes are very helpful if I can get 3 layers down. Whirlwind to pHaze, or escape a Magnezone trying to set up (otherwise I would be dead by the time Skarm could use it).

Blissey @Leftovers
Natural Cure
EVs: 252 Def/40 SpAtk/218 SpDef
Bold/Calm
-Aromatherapy/Heal Bell
-Ice Beam
-Softboiled
-Thunder Wave
Special wall that is EVed to be able to take a physical hit or two. Aromatherapy or Heal Bell (it doesn't matter which) heals the team's status ailments. Softboiled to stay alive and TWave to cripple sweepers. Which nature do you suggest I use? More Def or SpDef?
Again, I am open to any suggestions.
Changes in Bold.