First Competitive Team. Please Help

[ipodboqi]

I'm building a new competitive team using only move sets found online. I need help finding Pokés that would fit into my team. Another conflict that I have is my Alomomola and Forretress. Forretress serves as Special Wall, Spiker and Toxic Spiker, and a Rapid Spinner. Alomomola serves as Physical Wall, and a Staller (sort of). I want to change Forretress from being a Special Wall to a Physical Wall, and make Alomomola a cleric (or whatever the the healers are called).

Pokémon: All are Level 100

Alomomola (F) @ Damp Rock
Hydration
Relaxed Nature
252 HP/196 Def/60 SpAtk

Rain Dance
Toxic
Scald
Rest

Forretress (F) @ Leftovers
Sturdy
Careful Nature
252 HP/4 Def/252 SpDef

Spikes
Toxic Spikes
Pursuit
Rapid Spin

Golurk (?) @ Choice Band
Iron Fist
Adamant Nature
4 HP/252 Atk/252 Speed

Hammer Arm
Rock Slide
Eartquake
Shadow Punch

If I change Alomomola to a Cleric, and Forretress to a Physical wall, then I'll need a special wall, and I still need a dedicated Special Attacker, and that leaves one space for whatever role would be best. Thanks in advance for helping me with my dilemma and/or for helping find pokemon to fill the roles I need. Also, if possible, please help me find a way to make some pokemon have more than one role, Like Forretress.

 

[PlatinumDude]

Okay, to be honest, Alomomola isn't very good in OU, and it's outclassed by Vaporeon, who can take special hits more easily. Use that instead. I'll suggest a cleric later on:
-Wish
-Scald
-Protect
-Toxic/Ice Beam/Roar
Nature: Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Water Absorb

Don't use Pursuit on Forretress; it's just too weak without a boost (Scizor and Tyranitar can do it better because they can force switches more easily). Use Earthquake (for Steels), Gyro Ball (for STAB) or Volt Switch (to escape from Magnezone) instead. Use Stealth Rock instead of Toxic Spikes, since you already have a Toxic user already.

Golurk is too slow. Use this EV spread instead: 208 HP/252 Atk/48 Spe.

Blissey or Chansey can be used as your cleric/special wall:
-Aromatherapy
-Softboiled
-Seismic Toss/Flamethrower (latter for Blissey)
-Toxic/Thunder Wave
Nature: Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers/Eviolite (latter for Chansey)
Ability: Natural Cure

You can use Hydreigon as your Special attacker:
-Draco Meteor/Dragon Pulse
-Dark Pulse
-Fire Blast
-Focus Blast/U-turn
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Expert Belt

I think your team could use a mixed attacker to help with both sides of the offensive spectrum, like Infernape:
-Fire Blast/Overheat
-Close Combat
-Grass Knot/U-turn
-Stone Edge/Mach Punch
Nature: Hasty/Naive
EVs: 252 Atk/4 SAtk/252 Spe
Item: Life Orb

 

[ipodboqi]

So switch Alomomola for Vaporeon. What roles would Forretress serve? Just Entry Hazards and Rapid Spinning?

 

[Musica]

So switch Alomomola for Vaporeon. What roles would Forretress serve? Just Entry Hazards and Rapid Spinning?

Yes, do that.

Forretress @ Leftovers
Sturdy
Relaxed Nature (+Def -Spe)
252 HP 252 Def 4 SpDef
-Rapid Spin
-Spikes / Stealth Rock
-Toxic Spikes
-Volt Switch / Gyro Ball / EQ

Make Forretress as defensive as possible, it really wouldn't last long with Special Attacks even running on a Sassy / Careful Nature. Vaporeon would do the job in absorbing Special Attacks.

Vaporeon @ Leftoers
Water Absorb
Calm Nature (+SDef -Att)
240 HP 80 Def 188 SDef <-EV Spread maximizes Vaporeons high HP and Sp.Def base stat while leaving room for a bit of Physical resistance
or 252 HP / 252 SDef / 4 Def if you really want it to be specially defensive.

-Wish
-Protect
-Scald
-Roar

You need roar to be a phazer to boosting switch-ins. Scald is when you are taunted.

 

[wolf]

Please use the Simple Q&A Thread next time if you have questions regarding team advice. The forum is mainly for (mostly) complete teams. Still, I'm leaving this open since your team looks close to finished now.