Steeling Yo Swag

[Lazer]

Tier: Pokémon Showdown OU Monotype

Steel-type Pokémon are the among the best defensive Pokémon with the highest average defenses and most resistances. However, they are often not used as a primarily offensive monotype because of their low speeds despite many Pokémon having high offensive stats and decent move pools. There is Trick Room to fix that. Steel-type is the best type to run Trick Room despite the fact that more psychic-types and ghost-types know the move. This is because many of the better offensive psychic-type Pokémon have fairly high speed, and the ghost-type Pokémon capable of setting up Trick Room are rather fail and cannot set it up as many times as a Bronzong or Klingklang. And so, I present my Trick Room mono-steel team.

UPDATED AS OF 1 OCTOBER 2013, 5:26 PM.

Zing (Bronzong) @ Leftovers
Trait: Levitate
EVs: 4 HP / 252 Def / 252 SDef
Sassy Nature
IVs: 0 Spd
- Trick Room
- Earthquake
- Gyro Ball
- Zen Headbutt
It's one of the three steel-types allowed in OU capable of using Trick Room and is the best defensively, therefore, it can set up many times. Also, Bronzong can be useful to switch onto when some Pokémon is obviously going to throw an earthquake.

Root Beer (Klinklang) @ Air Balloon
Trait: Clear Body
EVs: 252 Atk / 60 Def / 196 SDef
Sassy Nature
IVs: 0 Spd
- Trick Room
- Gear Grind
- Toxic
- Volt Switch
The other Trick Room steel-type. It's quite self-explanatory. I am unsure if I should use Toxic or Volt Switch. Toxic is useful to throw onto fire or ground-type sweepers which are exceedingly annoying. Volt Switch because stupid Wobbufett is allowed in Smogon OU, which totally screws me up if it switched onto this. Gear Grind can usually break substitutes and get in a little damage. Protect is useful when the situation arises.

Caspia (Jirachi) @ Iron Ball
Trait: Serene Grace
EVs: 252 HP / 252 Atk / 4 SDef
Brave Nature
IVs: 0 Spd
- Trick Room
- Zen Headbutt
- Fire Punch
- Ice Punch
The only other choice I had to set up for Trick Room. Hopefully Honedge is a slow Pokémon with high attack and defenses with the move Trick Room. Because, I hate chaining Jirachi like this. It makes it a pretty good physical sweeper, not to mention with Serene Grave freezing turns from a miracle to a gamble, but the lack of a different item like leftovers to help it is kind of disappointing. Aside from that, it's a good sweeper that can survive both switch-ins and set up Trick Room. Flinch, burn, freeze.

Luminae (Empoleon) (M) @ Choice Specs
Trait: Torrent
EVs: 252 HP / 4 Def / 252 SAtk
Quiet Nature
IVs: 0 Spd
- Surf
- Ice Beam
- Grass Knot
- Flash Cannon
My primarily special sweeper. It's pretty useful for fire and ground-types.

YOLO (Aggron) (M) @ Choice Band
Trait: Rock Head
EVs: 252 HP / 252 Atk / 4 SDef
Brave Nature
IVs: 0 Spd
- Head Smash
- Earthquake
- Heavy Slam
- Aqua Tail
This is my favorite sweeper. It can usually take out two to four Pokémon per a Trick Room session, mainly with the ever unreliable Head Smash.

Solyanka (Heatran) (F) @ Choice Specs
Trait: Flash Fire
EVs: 248 HP / 252 SAtk / 8 SDef
Quiet Nature
IVs: 30 Atk / 30 SAtk
- Fire Blast
- Earth Power
- Dragon Pulse
- Eruption
It's funny to switch onto fire-type moves or Will-O-Wisp with Heatran. If anyone's questioning Dark Pulse, it's because of annoyingly bulky psychic-types.

 

[PlatinumDude]

What's the point of Bronzong having a Brave nature when it's not investing in Attack at all? Bronzong's 89 Attack is somewhat mediocre, so change the EV spread to 252 HP/252 Atk/4 SDef. Given Bronzong's high defenses, it can also go the support route with a Sassy nature and 252 HP/4 Def/252 SDef.

While Klinklang is somewhat fast for Trick Room, it has the right tools to function in the environment despite its shallow movepool. Why Protect, though?:
-Trick Room
-Gear Grind
-Volt Switch
-Toxic
Nature: Brave/Sassy
EVs: 252 HP/252 Atk/4 SDef or your current spread. I'd like to know what KOs your current EV spread avoids.
Item: Leftovers/Air Balloon
Ability: Clear Body

What purpose do Jirachi's Special Defense EVs serve? What KOs does it avoid by going this way? If it doesn't avoid anything notable, 252 HP/252 Atk/4 SDef is the way to go.

Flash Cannon has redundant coverage with Empoleon's other moves. Have you considered Choice Specs?:
-Hydro Pump
-Ice Beam
-Grass Knot/Hidden Power (Grass)
-Surf/Sleep Talk
Nature: Quiet
EVs: 252 HP/252 SAtk/4 SDef
Item: Choice Specs
Ablity: Torrent

Have you even considered Choice Specs Eruption Heatran? That thing hits like a fast nuke in Trick Room and outside of Rain:
-Eruption (note a fully powered Eruption outdamages a 2x supereffective non-STABed Dark Pulse)
-Earth Power
-Dragon Pulse/Hidden Power (Ice)
-Fire Blast (see Eruption; 85% accuracy isn't even that bad, at least it's more accurate than Focus Blast or Stone Edge)
Nature: Quiet
EVs: 248 HP/252 SAtk/8 SDef
Item: Choice Specs
Ability: Flash Fire

 

[Lazer]

Constructive criticism stuff.

Bronzong has Brave because I forgot to change that from an old Trick Room offensive Bronzong set. I would go the special defense route, but it's the only Pokémon on my team (and Jirachi depending on what's using the move) that can switch onto Close Combats with a decent amount of HP left. I'll think about that.

That makes more sense; should've of thought of that on Klingklang.

I'll probably switch on Empoleon is the item to Choice Specs. Not really sure about swapping out Flash Cannon for Hydro Pump, but I'll see things as I go. I'll try Specs on Heatran, but I may switch back to balloon because of the fact that it can avoid Earthquakes.

 

[PlatinumDude]

I also forgot to mention that if you go back to Air Balloon, consider giving Heatran Stealth Rock over Dark Pulse and replace Flamethrower with Fire Blast. Sometimes missing out on a KO is annoying:
-Stealth Rock
-Fire Blast
-Earth Power
-Hidden Power (Ice)/Dragon Pulse
Nature: Quiet
EVs: 248 HP/252 SAtk/8 SDef
Item: Air Balloon/Life Orb
Ability: Flash Fire

Or you can also consider Ferrothorn, who can use its good bulk and defensive typing to get hazards up easily:
-Spikes/Stealth Rock
-Leech Seed/Stealth Rock
-Power Whip/Protect
-Gyro Ball/Thunder Wave
Nature: Relaxed
EVs: 252 HP/48 Def/208 SDef
Item: Leftovers

 

[Lazer]

I also forgot to mention

Yeah, I was thinking about changing Heatran's balloon set after your advice anyways.
Also, Ferrothorn seems like something that takes up space. Trick Room is about sweeping hard and fast under a little time window.