Gen 4 — Singles⏱ 12 min readUpdated: April 2026
Gen 4 — Singles · Smogon OU

Generation 4 OU — Singles Format Reference

Gen 4 OU is the format the physical/special split built. Stealth Rock arrived as the universal hazard. Choice Scarf, Choice Specs, and Life Orb landed as the offensive item set. The combination redrew every offensive Pokémon's expected output, and many of the era's defining sets stayed canonical for decades.

Cartridge

Diamond / Pearl / Platinum / HGSS

Type

6v6 Singles

Status

Frozen tier

Era

Post-split foundational

Stealth Rock and the phys/spec split arrived together. The first redrew defense; the second redrew offense. DPP OU is what came out the other side.
— The Gen 4 OU structural fact

At a glance

DPP / HGSS OU is the Singles format that turned competitive Pokémon into a hazard war. Stealth Rock distribution made every Stealth Rock-weak Pokémon (Charizard, Volcarona-equivalent Moltres, Articuno) structurally fragile.

Smogon's tournament communities — SPL, Smogon Tour, Smogon Premier League — kept DPP OU active for over a decade. The format is now frozen but stays one of the most-played retro formats on Smogon Showdown.

  • Format type6v6 Singles, all six brought to battle
  • MechanicsPhysical/special split + Stealth Rock + Choice items + Life Orb
  • StatusFrozen — meta stable since Gen 5 succession
  • Where it's playedPokémon Showdown ladder + retro tournaments. Live tier page: /dpp/ou.
  • Sister formatsUbers (above), UU (below)

Format rules

Gen 4 OU applies the standard Smogon Singles clauses formalised in the ADV era. Megas and Z-Moves do not exist yet.

ClauseEffect
Sleep ClauseOnly one opposing Pokémon may be put to sleep at a time.
Species ClauseEach team can only carry one of any given species.
Evasion ClauseEvasion-boosting moves and abilities are banned.
OHKO ClauseSheer Cold, Fissure, Horn Drill, Guillotine are banned.
Endless Battle ClauseBattle states that cannot end are forbidden.
Moody ClauseMoody is banned outright.
Soul Dew ClauseSoul Dew is BANNED — Latias / Latios cannot hold it in OU.
Sleep Counter ruleSleep counter PERSISTS across switches in Gen 4 (rule changed in Gen 5).

Banlist

Gen 4 OU's banlist is dominated by Sinnoh-era box legendaries plus a handful of structural offensive threats — Garchomp most notably.

Notable Gen 4 OU bans

PokémonWhy it was banned
Garchomp130 Atk + 102 Spe + Outrage + Earthquake + Sand Veil. Banned to Ubers in DPP.
LatiasSoul Dew banned — Latias and Latios cannot hold it in OU.
LatiosSame Soul Dew clause as Latias.
ManaphyTail Glow + Hydration + Scald in rain. Permanent Ubers."
DarkraiBad Dreams + Dark Void + Sucker Punch. Permanent Ubers — sleep-stalling pattern was uncontestable.
Dialga100/120/120/150/100/90 + Spacial Rend / Roar of Time. Permanent Ubers.
Palkia100/100/100/150/120/100 + Spacial Rend. Permanent Ubers.
Giratina-Origin150/120/100/120/100/90 + Levitate + Shadow Force. Permanent Ubers.
Arceus120 base stats across the board + Multitype. Permanent Ubers.
Shaymin-Sky127/103/75/120/75/127 + Serene Grace Air Slash. Banned to Ubers.
WobbuffetShadow Tag + Counter / Mirror Coat. Banned for trapping pattern.
BlazikenSpeed Boost (DPP didn't have Hidden Ability distribution; banned in HGSS+ via DW).

The phys/spec split & Stealth Rock

Two structural changes arrived in Gen 4 simultaneously. The physical/special split unlocked offensive potential that had been engine-locked since Gen 1; Stealth Rock added a universal hazard that taxed every switch-in.

The split — refer to Era page

Pre-Gen 4: type determined whether a move was physical or special. Post-Gen 4: each move is individually categorised. For the underlying engine change, refer to the phys/spec split section of the Gen 4 Era guide.

Stealth Rock as the universal hazard

Stealth Rockdeals damage on switch-in scaled by the target's Rock weakness. 4× weak (Charizard, Articuno) takes 50%; 2× weak (most Flying / Bug / Fire / Ice) takes 25%; neutral takes 12.5%. The asymmetry produced a structural pressure no prior gen had matched.

50%

4× Rock weak

Charizard, Articuno on switch-in

25%

2× Rock weak

Most Flying / Bug / Fire / Ice

12.5%

Neutral

Most Pokémon

6.25%

Rock-resist

Steel, Fighting, Ground

Choice Scarf, Choice Specs, Life Orb

The offensive item set arrived in Gen 4. Choice Scarf + 50% Speed locks the holder into one move. Choice Specs + 50% Special Attack with the same lock. Life Orb + 30% damage at the cost of 10% max HP per attack. Every offensive Pokémon in DPP OU runs one of these — Choice Scarf Tyranitar, Choice Specs Latias, Life Orb Heatran.

Archetypes

DPP / HGSS OU's archetypes cluster around offensive item choice and hazard support. Most teams carry Stealth Rock + Spikes + a Stealth Rock-weak abuser supported by Rapid Spin.

Aggressive

Hyper Offense

Six offensive Pokémon. Common build: Azelf suicide-lead Stealth Rock + Explosion, Tyranitar Banded, Salamence MixMence, Heatran Specs, Lucario Swords Dance, late-game cleaner.

Aggressive

MixMence Offense

SalamenceMixed (Outrage + Draco Meteor + Fire Blast + Earthquake) is the format's archetypal pivotal Pokémon. The post-split engine made mixed sets viable for the first time.

Balance

Bulky Offense

3-4 offensive Pokémon plus 2-3 defensive pivots. Defining cores: Tyranitar Sand + Heatran Lava Plume + Skarmory Spikes + Blissey Wish.

Defensive

Stall

Six defensive Pokémon. Skarmory + Blissey + Tyranitar + Forretress Rapid Spin + a wincon (Calm Mind Suicune / Vaporeon Wish).

Specialty

Sand Offense

TyranitarSand Stream + offensive Sand abusers. Less centralised than BW2 sand (no Excadrill in Gen 4 OU until HGSS's Sand Rush distribution).

Specialty

Trick Room

Bronzong + Slowbro setup + Snorlax + Marowak / Hariyama abusers. Niche archetype — TR setters less robust than later gens.

The seven team roles

The seven structural roles apply to Gen 4 OU. Mega Evolution does not exist yet; the cornerstone slot is filled by Choice item users.

1. Hazard setterStealth Rock + Spikes

Defining setters: Skarmory (Spikes + Whirlwind + Roost), Forretress (Spikes + Rapid Spin), Heatran (Stealth Rock), Azelf (Stealth Rock suicide lead).

2. Hazard controlRapid Spin (Defog removes hazards from Gen 6+)

Defining spinners: Forretress (Sturdy + Rapid Spin), Starmie (offensive Rapid Spin), Donphan (defensive Rapid Spin). Spinblockers: Gengar, Rotom-Wash.

3. Speed controlChoice Scarf / priority

Defining options: Tyranitar Choice Scarf, Heatran Choice Scarf, Flygon Choice Scarf U-turn, priority via Scizor Bullet Punch and Lucario Extreme Speed.

4. Status absorberMagic Guard / Natural Cure

Defining absorbers: Clefable Magic Guard, Blissey Natural Cure, Celebi Natural Cure, Heatran Flash Fire.

5. PivotU-turn / Volt Switch (Gen 5+)

Volt Switch arrives in Gen 5 — Gen 4 has only U-turn for in-attack pivoting. Defining pivots: Scizor U-turn, Flygon U-turn, Salamence U-turn.

6. WallbreakerChoice Specs / Choice Band / Setup

Defining breakers: Specs Latias / Latios, Specs Heatran, Banded Tyranitar, MixMence Salamence, Lucario Swords Dance.

7. Win conditionSetup sweeper / progressive cleric

Defining wincons: Lucario Swords Dance + Extreme Speed, Suicune Calm Mind + Rest, Gyarados Dragon Dance, Magnezone trap-and-kill (Skarmory removal).

What makes Gen 4 OU different

Gen 4 OU is the cleanest competitive expression of the post-split engine. No Mega slot, no Z-Move slot, no permaweather (mostly) — just stats, items, hazards, and the offensive ceiling that Choice items produce.

✓

Stealth Rock

Universal hazard introduced

✓

Phys/Spec split

Per-move categorisation

✗

Mega Evolution

Not introduced until Gen 6

  • Stealth Rock pressure — every team carries Stealth Rock. Rapid Spin support is non-negotiable for teams running Stealth Rock-weak Pokémon.
  • The Choice item meta — the offensive ceiling sits with Specs / Band / Scarf users. Setup sweepers exist but Choice items are the structural offence.
  • Magnezone trapping — Magnet Pull on Magnezone traps opposing Steel-types. Hidden Power Fire + Magnet Pull is the format's primary Skarmory removal pattern.
  • Sleep counter persists across switches — Gen 4's sleep counter does not reset on switch-out (rule changed in Gen 5). This made Spore on Breloom particularly punishing.

How to get started

DPP / HGSS OU has 15+ years of tournament archive. Smogon's analyses are exhaustive; sample teams are stable.

  1. Read Smogon's Gen 4 OU tier page — banlist locked, Pokémon analyses final.
  2. Choose your Choice item slot — Tyranitar Banded, Heatran Specs, Latios Specs, Tyranitar Scarf revenge are the format's most-played wallbreakers.
  3. Pair with a hazard setter and remover — Stealth Rock + Spikes from Skarmory or Forretress, removal via Starmie or Forretress Rapid Spin.
  4. Copy a sample team — Smogon's vetted Gen 4 OU samples are stable.
  5. Ladder Pokémon Showdown — Gen 4 OU has an active retro ladder. Tournament play continues via Smogon Tour and SPL.

Where to go from here

The above is the static reference for Gen 4 OU. Live frozen-tier data lives in the rest of Pokékipe.

  • Live tier data — /dpp/ou for Gen 4 OU usage and Pokémon stats.
  • Mechanics — Gen 4 — Diamond & Pearl covers the phys/spec split, Stealth Rock, abilities, and items.
  • Adjacent formats — Gen 5 OU covers the Black & White format that succeeded Gen 4.
  • Tournament history — Timeline tracks Smogon Tour and SPL Gen 4 OU results.