Well, since I don't have much time, I am going to make this quick.
Magnezone:
Ability: Magnet Pull
Nature: Timid
Item: Magnet:
EV's: 212 SP.Atk, 80 SP.Def, 176 Speed
Moves: Substitute, Thunderbolt, HP Fire, Explosion
BBasically, Magnezone is used to trap and destroy Common Steel types such as Ferrothorn, Forretress, and Scizor with HP Fire.
It can also take care of Pokemon such as Wish Vaporeon or Drizzle Politoed.
It's Explosion attack is used as a last resort when it's HP is low.
Jolteon:
Ability:Volt Absorb
Nature:Timid
Item: Choice Specs
EV's:252 SP.ATK, 252 Speed
Moves:Thunderbolt, Shadow Ball, HP Grass, Volt Switch
Basically with Jolteon, it's pretty much used to switch in and destroy Pokemon.
Water Types, Ground Types, Flying Types, Psychic Types, and Ghost Types stand no chance against Jolteon. It is also able to switch out quickly, with volt switch and high speed
Mienshao:
Ability: Regenerator
Nature: Naive
Item: Life Orb
Ev's: 252 Atk, 252 Speed, 4 SP.Atk
Moves:Substitute, U-turn, HP Ice, Hi-Jump Kick
Mienshao is pretty much just used for type coverage. It can take down bulky Normal types, such as Blissey, Chansey, and Snorlax. With the Regenerator Ability, it can switch out when it needs to recover.
Ferrothorn:
Ability: Iron Barbs
Nature: Relaxed
Item: Rocky Helmet
Ev's:252 HP, 88 Defense, 168 SP. Defense
Moves: Spikes, Gyro Ball, Protect, Leech Seed
Ferrothorn is the bulky/wall Pokemon of the team. With such slow speed, Gyro ball is a must have. It can also recover easily with leech seed and protect. It is also used for laying down entry hazards
Hippowdon
Ability: Sand Stream
Nature: Impish
Item: Leftovers
Ev's: 252 HP, 244 SP.Defense, 12 Defense
Moves: Earthquake, Slack Off, Stealth Rock, Ice Fang
Hippowdon is great for many, many reasons. One, it is bulky, two it has good type coverage, and three, it can lay down entry hazards without having to worry about being knocked out.
Hippowdon is also used for it's Ability, Sand Stream.
Scizor
Ability: Technician
Nature: Adamant
Item: Life Orb
EV's: 252 HP, 112 Atk, 144 SP.Defense
Moves: Pursuit, Bullet Punch, U-turn, Roost
Scizor is pretty much just here as a pysical attacker. With roost, it can last quite a bit longer than it would without it. It also can use the Technician ability to it's advantage.

Magnezone:
Ability: Magnet Pull
Nature: Timid
Item: Magnet:
EV's: 212 SP.Atk, 80 SP.Def, 176 Speed
Moves: Substitute, Thunderbolt, HP Fire, Explosion
BBasically, Magnezone is used to trap and destroy Common Steel types such as Ferrothorn, Forretress, and Scizor with HP Fire.
It can also take care of Pokemon such as Wish Vaporeon or Drizzle Politoed.
It's Explosion attack is used as a last resort when it's HP is low.

Jolteon:
Ability:Volt Absorb
Nature:Timid
Item: Choice Specs
EV's:252 SP.ATK, 252 Speed
Moves:Thunderbolt, Shadow Ball, HP Grass, Volt Switch
Basically with Jolteon, it's pretty much used to switch in and destroy Pokemon.
Water Types, Ground Types, Flying Types, Psychic Types, and Ghost Types stand no chance against Jolteon. It is also able to switch out quickly, with volt switch and high speed

Mienshao:
Ability: Regenerator
Nature: Naive
Item: Life Orb
Ev's: 252 Atk, 252 Speed, 4 SP.Atk
Moves:Substitute, U-turn, HP Ice, Hi-Jump Kick
Mienshao is pretty much just used for type coverage. It can take down bulky Normal types, such as Blissey, Chansey, and Snorlax. With the Regenerator Ability, it can switch out when it needs to recover.

Ferrothorn:
Ability: Iron Barbs
Nature: Relaxed
Item: Rocky Helmet
Ev's:252 HP, 88 Defense, 168 SP. Defense
Moves: Spikes, Gyro Ball, Protect, Leech Seed
Ferrothorn is the bulky/wall Pokemon of the team. With such slow speed, Gyro ball is a must have. It can also recover easily with leech seed and protect. It is also used for laying down entry hazards

Hippowdon
Ability: Sand Stream
Nature: Impish
Item: Leftovers
Ev's: 252 HP, 244 SP.Defense, 12 Defense
Moves: Earthquake, Slack Off, Stealth Rock, Ice Fang
Hippowdon is great for many, many reasons. One, it is bulky, two it has good type coverage, and three, it can lay down entry hazards without having to worry about being knocked out.
Hippowdon is also used for it's Ability, Sand Stream.

Scizor
Ability: Technician
Nature: Adamant
Item: Life Orb
EV's: 252 HP, 112 Atk, 144 SP.Defense
Moves: Pursuit, Bullet Punch, U-turn, Roost
Scizor is pretty much just here as a pysical attacker. With roost, it can last quite a bit longer than it would without it. It also can use the Technician ability to it's advantage.