IVs and Breeding: Raising Perfect Pokémon

Individual Values — the six hidden numbers embedded in every Pokémon that determine its statistical ceiling — sit at the foundation of competitive play. This page covers what IVs are, how breeding mechanics generate and transfer them, the tools available across game generations to verify and manipulate them, and the real tradeoffs involved in chasing perfection. Whether the goal is a 6-IV sweeper or a precisely calibrated Trick Room setter with 0 Speed IVs, the mechanics that govern both are the same.

• Definition and Scope
• Core Mechanics or Structure
• Causal Relationships or Drivers
• Classification Boundaries
• Tradeoffs and Tensions
• Common Misconceptions
• Checklist or Steps
• Reference Table or Matrix

Definition and Scope

Every Pokémon generated in the main series games carries a hidden value between 0 and 31 in each of six stats: HP, Attack, Defense, Special Attack, Special Defense, and Speed. These are Individual Values, universally abbreviated as IVs. A value of 31 represents the theoretical maximum contribution that stat can receive from IVs alone at Level 100. A value of 0 contributes nothing — which sounds like a penalty, but in competitive play a deliberate 0 Speed IV is the backbone of every Trick Room team that has ever won a Regional Championship.

IVs interact directly with the stat calculation formula defined in the main series games since Generation III. At Level 100, each IV point in a non-HP stat contributes exactly 1 point to the final stat total. In HP, the formula grants 2 stat points per IV point, making a perfect 31 HP IV worth 31 additional HP at maximum level compared to a 0 IV specimen of the same species and Nature. These are not large margins in isolation — but competitive margins at the highest level are measured in the space of one or two stat points, which is why the Pokémon EV Training Guide and IV breeding exist as parallel disciplines.

The full scope of IV manipulation spans wild encounters, breeding, in-game hyper training mechanics (introduced in Generation VII's Pokémon Sun and Moon), and Raid Den dens in Generation VIII's Pokémon Sword and Shield. Each method has distinct time costs, accessibility, and permanence characteristics.

Core Mechanics or Structure

The Stat Formula

The standard stat formula (HP excluded) is:

Stat = floor(floor((2 × Base + IV + floor(EV/4)) × Level / 100 + 5) × Nature modifier)

The IV slots directly into this formula as a flat addend alongside the base stat and EV contribution. This is why IVs and EVs are always discussed together — they occupy adjacent positions in the same equation. The Pokémon natures and stats reference covers the Nature multiplier component.

Breeding and IV Inheritance

When two Pokémon are left at a Day Care or Picnic (the Pokémon Scarlet and Violet term, covered more fully at the Pokémon Scarlet and Violet reference page), the egg produced can inherit IVs from its parents. The inheritance rules have evolved significantly across generations:

• Generations II–V: Three IVs were passed randomly from either parent, with no player control over which stats were selected.
• Generation VI onward (X and Y): The Destiny Knot hold item, when held by either parent, forces 5 of the 6 IVs in the offspring to be inherited from the combined parent pool. The 6th IV is generated randomly. This single item change transformed IV breeding from a probabilistic ordeal into a tractable optimization problem.
• The Power Items (Power Bracer, Power Belt, Power Lens, Power Band, Power Anklet, Power Weight): When held by a parent, each item guarantees that parent's IV in the corresponding stat is passed to the offspring. One Power Item plus one Destiny Knot on the other parent guarantees 1 specific IV and then randomly selects 4 more from the combined 12-IV parent pool.

Hyper Training

Introduced in Generation VII (Pokémon Sun and Moon), Hyper Training allows a Level 100 Pokémon to have any IV "maxed" to behave as 31 for all stat calculation purposes. The underlying IV value does not change — which has consequences for Hidden Power type calculations and other mechanics that read the raw IV — but for damage and stat purposes, Hyper-Trained stats are functionally equivalent to 31. The currency is Bottle Caps (single stat) or Gold Bottle Caps (all six stats simultaneously), obtainable through various in-game sources.

Causal Relationships or Drivers

The demand for perfect IVs is almost entirely a competitive phenomenon. In a casual playthrough at Level 50 or even Level 100, the difference between a 31 IV and a 20 IV in Speed is 11 stat points — meaningful in a Speed tie scenario, invisible in story content. The causal chain runs from competitive format rules (which in formats like the Video Game Championship Series use Level 50 scaling, documented at the VGC competitive ruleset page) to the necessity of precise stat benchmarks to the demand for perfect IV specimens.

Speed tiers are the clearest driver. If a Pokémon needs to outspeed a specific threat running maximum Speed investment, there is exactly one IV value that guarantees that outcome: 31. Missing it by even 1 IV point loses the Speed tie with identical opponents. The competitive Pokémon formats page maps these tier dynamics in full.

Damage calculation is the second driver. A Pokémon with a 30 Attack IV versus 31 may lose a KO threshold that would otherwise clean up a target at a specific HP value. At the margins of competitive play — which is where Smogon damage calculators and VGC preparation live — these thresholds are not theoretical.

Classification Boundaries

Not all IV targets are 31. The competitive taxonomy splits into three categories:

1. Maximum IVs (31): Desired in every attacking stat, defensive stats, and Speed when running max-Speed builds.
2. Minimum IVs (0): Specifically desired in Attack for special attackers (to minimize confusion and foul play damage), Speed for Trick Room attackers (to move last and therefore first under room reversal), and occasionally HP to hit specific Pokémon-GO transfer thresholds.
3. Specific non-zero, non-max IVs: Legacy Hidden Power breeding from Generations II–VII required precise IV combinations across multiple stats to achieve a desired Hidden Power type at 70 base power. A Hidden Power Fire set required IVs like 31/30/31/30/31/30 — a six-stat constraint that made breeding substantially more complex than a simple 6×31 target.

Hyper Training does not satisfy case 2 or case 3 — it can only simulate 31, not 0 or an intermediate value. A Trick Room attacker needing 0 Speed IVs must either breed for that value or obtain a wild encounter that naturally generates it.

Tradeoffs and Tensions

The central tension in IV breeding is time versus control. A Destiny Knot plus two parents each carrying perfect IVs in different stats allows rapid convergence — statistically, a perfect 6-IV offspring emerges approximately once per 32 eggs when both parents collectively cover all 6 stats at 31. That's the mathematical floor. In practice, breeders cycling through a stat-by-stat replacement strategy can achieve a perfect parent pair in 3–5 breeding generations.

The second tension is between perfect IVs and Egg Moves. Egg Moves — moves an offspring can only obtain by inheriting them from a father (or, in Generation VI onward, either parent in the same egg group) — sometimes require sourcing a parent that carries useful IVs but is not the breeder's current champion specimen. Introducing a new parent resets part of the IV optimization process.

Hyper Training resolves much of this tension post-game, but it costs Bottle Caps that must be farmed. The Pokémon held items reference covers Destiny Knot, Power Items, and Bottle Cap acquisition contexts in more detail.

The third tension is Nature. A perfect-IV Pokémon with the wrong Nature is rarely usable at high-level play. Since Natures must be either bred in (via the Everstone, which passes the holder's Nature to offspring with 100% probability since Generation VI) or changed via Mints (Generation VIII onward), IV breeding and Nature locking must be coordinated from the start. Mints change the stat behavior of a Nature without changing the Nature label itself — which matters for certain Pokémon that have flavor interactions tied to Nature identity.

For a complete overview of how IVs fit into the broader architecture of Pokémon statistics, the key dimensions and scopes of Pokémon page provides the wider framework, and pokemonauthority.com maintains updated references across all generations.

Common Misconceptions

"Hyper Training gives you a real 31 IV." It does not. The game's Hidden Power calculation, which reads raw IV values, still uses the original IV. A Hyper-Trained Pokémon with a 30 IV in Special Attack will calculate Hidden Power type as if that IV is 30, not 31. This was more consequential before Generation VIII removed Hidden Power from the move pool for most competitive applications.

"6-IV Pokémon are always optimal." The Attack IV on a fully special Pokémon is frequently targeted at 0, not 31, to minimize damage taken from Foul Play (which uses the target's Attack stat) and to reduce confusion self-hit damage. A Garchomp running a fully physical set wants 31 Attack; a Blissey running Seismic Toss generally wants 0 Attack.

"IV breeding requires the same species." Breeding only requires compatible Egg Groups. A Ditto, which can breed with nearly any Pokémon capable of breeding regardless of species, is the universal IV donor in competitive breeding. Two Pokémon from different species but the same Egg Group can also breed, which is how Egg Moves chain through populations.

"Shiny Pokémon have better IVs." Shiny status in Generation VI and beyond is determined by the Trainer ID and Secret ID XOR calculation with the personality value — it has no causal relationship to IVs. A shiny Pokémon can have 0 IVs in every stat. The shiny Pokémon hunting guide covers the probability mechanics separately.

Checklist or Steps

The following sequence describes the breeding pipeline for a 6-IV competitive Pokémon with locked Nature and Egg Moves, as practiced across Generations VI–IX:

1. Identify target: Confirm desired species, Nature, moveset (including Egg Moves), and IV spread (e.g., 31/0/31/31/31/31 for a special attacker).
2. Secure a Ditto with high IVs: Ditto with 5–6 perfect IVs, obtainable through Ditto-specific raid dens, wonder trade communities, or GTS equivalents. Confirm its Nature is irrelevant for Ditto since it cannot pass Nature.
3. Obtain an Everstone: Place on the parent carrying the desired Nature to lock that Nature onto offspring with 100% probability (Generation VI onward).
4. Equip Destiny Knot: Place on Ditto (or the high-IV parent) to force 5 IV inheritance from the combined parent pool.
5. Hatch first-generation eggs: Sort offspring by IVs using the Judge function (unlocked via the Battle Tower or equivalent). Identify offspring covering the most desired IV slots.
6. Rotate best offspring into parent slot: Replace the lower-IV parent with the best offspring. Continue cycling until both parents collectively hold perfect IVs in all 6 target stats.
7. Add Egg Move donors if needed: Introduce a parent carrying the desired Egg Move. Accept temporary IV regression; breed out in subsequent generations.
8. Lock the Everstone on the Nature-correct parent throughout.
9. Final hatch: With optimal parents established, hatch until a target-IV specimen emerges. Statistically, under ideal conditions this averages approximately 1 in 32 eggs for a 6×31 target.
10. Apply Mint if Nature was missed: Generation VIII and IX allow Mints to correct Nature behavior post-hatch without IV regression.
11. Hyper Train any remaining suboptimal IVs (Generation VII onward) using Bottle Caps at the Battle Tower equivalent.

Reference Table or Matrix

IV Breeding Mechanic Comparison by Generation

IV Value Impact at Level 100