The decision tree
Start here:
- Is your Pokémon Hazard-vulnerable (4× Rock weak, takes 50% from Stealth Rock)? → Heavy-Duty Boots, no exceptions.
- Are you running a Paradox Pokémon (Iron Hands, Flutter Mane, Roaring Moon, etc.)? → Booster Energy almost always.
- Are you a setup sweeper (Dragon Dance, Calm Mind, Swords Dance)? → Leftovers or Booster Energy (preserves bulk through setup).
- Are you running 4 attacks with no setup? → Choice Band (physical), Choice Specs (special), Choice Scarf (revenge killer / cleaner). Or Life Orb if you need to switch moves.
- Are you a defensive wall? → Leftovers, Heavy-Duty Boots, Rocky Helmet (vs. contact attackers), or Eviolite (Chansey, Dusclops).
- Are you a pivot (U-turn / Volt Switch / Teleport user)? → Heavy-Duty Boots almost always.
Item-by-item breakdown
Heavy-Duty Boots
Immune to entry hazards (Stealth Rock, Spikes, Toxic Spikes, Sticky Web). The single most-used item in OU because Stealth Rock is in 80%+ of teams. Any Pokémon with 4× Rock weakness MUST run Boots (Volcarona, Charizard, Yanmega, etc.).
Choice Band / Specs / Scarf
+50% to one stat (Atk / SpA / Spe), but you're locked into the first move chosen until you switch out. Use when:
- Band: Bulky physical attacker that 2HKOs most things from full HP without setup (Choice Band Garchomp Earthquake, Choice Band Iron Hands Wild Charge).
- Specs: Wallbreaker with hard-hitting STAB (Specs Dragapult Draco Meteor, Specs Iron Bundle Hydro Pump).
- Scarf: Revenge killer that outspeeds setup sweepers (Scarf Dragapult, Scarf Landorus-T, Scarf Iron Bundle).
Life Orb
+30% damage, but user loses 10% HP per attacking move. Best on Pokémon that want move flexibility without committing to one Choice move. Trades sustainability for raw power.
Pairs with: Magic Guard (Reuniclus, Clefable — ignores LO recoil), Sheer Force (Nidoking — LO recoil doesn't apply on boosted moves), Pokémon with reliable recovery (Roost, Recover) to mitigate the 10% chip.
Booster Energy
Activates Quark Drive / Protosynthesis — boosts highest stat by 30% (50% for Speed). Single-use, consumed on activation. Now the most-used item on Paradox Pokémon.
Common builds: Booster Spe (Iron Bundle, Flutter Mane, Iron Valiant, Roaring Moon), Booster Def (Great Tusk bulky set), Booster Atk (Iron Hands).
Assault Vest
+50% SpD, but user cannot use status moves. Turns physical attackers into mixed walls. Common on Iron Hands (140 base Atk + AV bulk), Conkeldurr, Tornadus-T.
Eviolite
+50% Def and SpD for not-fully-evolved Pokémon. Only practical users: Chansey (better than Blissey defensively), Dusclops (better than Dusknoir), Porygon2 (better than Porygon-Z defensively). Niche but transformative when applicable.
Leftovers
Recover 1/16 max HP at end of each turn. Standard wall item — pairs with Roost / Recover for double-healing. Black Sludge is the Poison-type variant (damages non-Poison holders).
Rocky Helmet
Contact attackers lose 1/6 max HP per hit. Great on physical walls like Garchomp, Skarmory, Ferrothorn — they passively chip incoming Iron Hands, Urshifu, Annihilape for switch-in damage.
Focus Sash
Survive a one-shot KO from full HP, then consumed. Best on suicide leads (Glimmora setting Stealth Rock + Toxic Spikes), revenge killers that need to land one priority move, and weak setup Pokémon.
Mirror Herb / Covert Cloak / Clear Amulet (Gen 9 newcomers)
Mirror Herb: Copies stat boosts the opponent gives themselves. Niche on Tinkaton or Garchomp vs. setup sweepers.
Covert Cloak: Prevents secondary effects (no Scald burn, no Iron Head flinch, no Make It Rain SpA drop). Defensive niche.
Clear Amulet: Prevents stat drops from opposing moves and abilities. Anti-Intimidate insurance — gives Iron Hands a way to ignore Landorus-T's Intimidate.