team seahawk

rhyperior@expert belt :
solid rock
nature:adamant
stone edge
eq
avalance
megahorn
hp252
atk252

machamp@muscleband :
noguard
nature:adamant
dynamic punch
bullet punch
stone edge
payback
hp252
atk252

rotom-w@wiseglasses
:levitate
nature:modest
discharge
shadow ball
hydro pump
signal beam
hp252
atk252

miltoic@leftovers
scald
nature:modest
icebeam
toxic
recover
spatk252
hp252

arcaine@life orb
intimate
nature:adamant
close combat
wild charge
flare blitz
extreme speed
spd252
atk252

scizor@life orb
tech
nature:adamant
bullet punch
u-turn
aerial ace
superpower/brick brake
atk252
spd252

We require you to post natures and EVs. This should be helpful if you are new to natures, EVs, or just competitive battling in general. Additionally, here is a list of every Pokémon with recommended natures, EVs, etc.

The team is Ok, but is a little weak to weather teams. You should add a weather counter.

Also Muscle Band and Wise Glasses are not that good. Decide between damage and survivability and replace them with either Life Orb or Leftovers. Trying to get the best of both worlds doesn't work that good.

I suggest making Machamp your lead and giving it the Lum Berry as its item to shrug off status. Also, take advantage of its decent bulk, since its Speed is rather bad: 240 HP/248 Atk/16 SDef/4 Spe.

Unless you're using Rhyperior for Rock Polish, don't bother maxing out its Speed. This EV spread (160 HP/252 Atk/96 Spe) allows Rhyperior to take hits more easily while outspeeding base 70 Speed Pokemon without Speed EVs. Give it the Choice Band.

Rotom-W is best with a Choice set or a tanking set (the latter to take advantage of its good defenses). Shadow Ball and Signal Beam provide no noteworthy coverage:
-Thunderbolt/Volt Switch
-Hydro Pump
-Hidden Power (Ice/Fire)
-Trick
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf

or
-Thunderbolt/Volt Switch
-Hydro Pump
-Will-o-Wisp/Hidden Power (Fire)
-Pain Split
Nature: Modest
EVs: 112 HP/252 SAtk/144 Spe
Item: Leftovers

Make Milotic Bold and use 252 HP/252 Def/4 SDef to give it more bulk.

Scizor is better with Choice Band or Swords Dance to make the most out of its 130 Attack:
-U-turn
-Bullet Punch
-Superpower
-Pursuit/Quick Attack
Nature: Adamant
EVs: 248 HP/252 Atk/8 Spe
Item: Choice Band
Ability: Technician

or
-Swords Dance
-Bullet Punch
-Superpower/Brick Break
-Bug Bite
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Leftovers/Life Orb
Ability: Technician

or
-Swords Dance
-Bullet Punch
-Bug Bite/Superpower
-Roost
Nature: Adamant
EVs: 252 HP/40 Atk/216 SDef
Item: Leftovers/Life Orb
Ability: Technician