Pokémon GO IV Guide — What IVs Mean & How to Check Them

What Are IVs in Pokémon GO?

IV stands for Individual Value — a set of three hidden numbers permanently assigned to every Pokémon the instant it is generated. Unlike CP, which changes every time you power up, IVs are immutable. They never change, cannot be trained, and follow that Pokémon forever.

Each IV ranges from 0 to 15 and corresponds to one of the three combat stats:

Think of IVs as a Pokémon’s “genetic lottery.” Two Charizard caught at the same level can have completely different battle performance because one rolled 15/15/15 and the other rolled 5/8/3. The difference between a 0% and 100% IV Pokémon is roughly 10% in CP and about 5% in actual battle performance — smaller than most players assume, but still meaningful at high levels.

How to Check IVs Using the In-Game Appraisal System

Since update v0.149.0, Pokémon GO has included a built-in appraisal system that displays your Pokémon’s IVs as a visual bar chart. You no longer need third-party apps to get an exact reading — though apps and websites like the IV Calculator can still help when you need precise numbers for PvP optimization.

Step-by-Step: How to Appraise Any Pokémon

Star Rating Breakdown

IV Search Terms — Filter Your Storage Instantly

Instead of appraising every Pokémon manually, use the in-game search bar to filter your entire collection by IV quality. These search terms work in the Pokémon storage search box and are one of the most underused tools for inventory management.

You can also combine search terms with species names. Typing garchomp & 3* shows only Garchomp with 3-star or higher IVs. Typing legendary & 4* filters for perfect Legendaries. Mastering these search terms saves hours of manual appraisal.

How IVs Affect CP, Stats & Battle Performance

IVs feed directly into the CP formula and the damage formula. Understanding how they affect each gives you the knowledge to decide whether a 96% IV Pokémon is worth powering up over a 91% — or whether you should hold out for the hundo.

IV Impact on CP

The CP formula uses (Base Attack + Attack IV) × √(Base Defense + Defense IV) × √(Base Stamina + Stamina IV). Because Attack is not square-rooted, the Attack IV has the largest impact on CP. A 15 Attack IV raises a Pokémon’s CP more than 15 Defense or 15 Stamina IV would. For most species at Level 40, the gap between 0% and 100% IVs is roughly 200–400 CP.

IV Impact on Battle Performance

In actual combat, the damage formula uses raw Attack and Defense — not CP. The difference between 0% and 100% IVs translates to approximately 5% more damage dealt and 5% less damage taken. That gap is meaningful in tight raid races and PvP mirror matches, but it will not turn a bad Pokémon into a good one. A 0% IV Mewtwo still outperforms a 100% IV Pidgeot in almost every scenario.

Best IVs for PvP — Why “Perfect” Is Not Always Best

Here is the counter-intuitive truth that separates casual players from competitive battlers: in PvP, a 100% IV Pokémon is often worse than a low-Attack, high-Defense/Stamina spread. This is because CP leagues (Great at 1,500, Ultra at 2,500) cap your total CP — and since Attack inflates CP more than Defense or Stamina, a high Attack IV forces your Pokémon to hit the cap at a lower level, leaving stat points on the table.

The PvP IV Paradox Explained

A 0/15/15 Azumarill can reach Level 40 under the 1,500 CP cap, while a 15/15/15 Azumarill hits the same cap at Level 36. The 0/15/15 version has more total stat points because it was allowed to power up four extra levels. Those extra levels add more Defense and HP than the 15 Attack IV adds in damage — making the “imperfect” spread objectively stronger in Great League.

Ultra League (2,500 CP) — The Middle Ground

Ultra League is less extreme than Great League but still rewards balanced IVs. Most species want Attack in the 5–10 range with Defense and Stamina at 13–15. Some bulky Pokémon like Cresselia and Registeel still benefit from low Attack spreads, while hard hitters like Giratina (Origin) and Swampert can afford slightly higher Attack because their base stats are already optimized for the cap.

How IVs Are Determined — Catch, Hatch, Trade & Purify

Not all Pokémon are created equal — and not all encounter types roll IVs with the same odds. Niantic guarantees minimum IV floors for certain activities, dramatically improving your chances of finding high-IV specimens.

Purification — The Guaranteed +2 Boost

When you purify a Shadow Pokémon, +2 is added to every IV (Attack, Defense, and Stamina), capped at 15. A 13/13/13 Shadow becomes a 15/15/15 hundo upon purification. A 14/14/14 also becomes perfect. This makes purification one of the most reliable paths to a 100% IV Pokémon — especially for Shadow Pokémon caught from Giovanni, which already have a 6/6/6 floor.

How to Check Exact IVs with an External Calculator

The in-game appraisal system shows bars, but it does not give you the exact number for each stat. When you need precision — especially for PvP rank optimization or deciding between two near-identical Pokémon — an external IV calculator is essential.

When You Need an IV Calculator

Common IV Mistakes — and How to Avoid Them

Pokémon GO IV FAQ