This was already thoroughly answered in our Pokemon GO IV Guide article, so just quoting it here:

IV stands for Individual Values. IVs are a mechanism to introduce diversity in a group of same species Pokemon. IV influences various other Pokemon stats, like the amount of Health Points, attack power, etc…

A good metaphor for IV is to think of them like Pokemon genes.

Not all Pokemon are born equal. Some Rattats are bigger, some Pidgeys attack harder and some Kakunas have more defense. In order to facilitate this diversity, IVs were introduced in the original Gameboy games and hidden away from the general player base. There are only 3 main IVs that you should remember:

  • Attack IV
  • Defense IV
  • Stamina IV

IV values go from 0 to 15. IVs are not the same thing as base stats. Even though base stats also depend on the specie, they increase when a Pokemon evolves – IVs always stay the same.

IVs play a big role in determining the true power and strength of every Pokemon you encounter in the wild. They are especially important when comparing same species Pokemon with similar Combat Power.

IVs and possible IV combinations are often displayed with a simple table:

Level Attack Defense Stamina Perfection %
38 15 14 3 71.00%
38 15 15 2 71.00%
40 10 15 0 55.00%
39 15 8 2 55.00%
40 13 8 0 46.00%
  • GonzoI

    Seeing how the stats apply to damage would be helpful. For example, attack is (base atk + IV atk) * CpM, so a base attack of 100 and an IV of 10 is an increase of 10% to your attack while a base attack of 50 and an IV of 10 is an increase of 20% to your attack because the IV is an absolute while the species might be weak or strong.

  • Franzi K

    It would be great to have some references how you can actually get to know the IV these values by just looking at the CP, HP, and level of the pokemon (and without reading it directly from the servers). Eg. what the common calculators on your side or the apps like Calcy and Pokegenie do.

  • Rohan Bhatt

    I would like to know something. I know sometimes when a pokemon is very high CP, IVs become irrelevant. Like a 0% IV Dragonite at level 30 would still be around 2800 CP or so which is still high and would hold or lead the gym for longer.
    Now my confusion is I hatched a Scyther once and then caught another 1 in wild in another city. For reaching 50 candies, I walked with it. The 1 I hatched is level 20 1300ish CP which would take Scizor to like 1500 CP or so and the 1 I caught is 1800ish CP which would take Scizor to like 2000 CP or so. The hatched 1 is 80% IV where as the Caught 1 is 40% IV with Attack 1/15. So for like entire lifetime, I would have to evolve only 1 then which 1 should I go with. Really cant figure out. Would be glad if any one could help. 🙂

    • Rillan

      IV gives u CP and from 1 up to 45 stat points. And there is huge difference between 3500+ CP and 2800+ so dont tell *stories*.
      U can walk with any u want to. Just evolve the genius one. (who has better IV) Base Cp doesnt matter since u can grow any pokemon.

      • Rohan Bhatt

        I you are comparing level 40 Dragonite Wonderful IVs (3500+ CP) with a level 30 Dragonite with poor IVs (2800+ CP). Compare them on the same levels. I never tell *stories* 🙂
        “Cp doesnt matter since u can grow any pokemon.” –> Ok got your point.

        • Rillan

          I want to say Lvl 40 perfect IV Dragonite and Lvl 40 terrible IV Dragonite will have huge difference. U loose like ~300 max potential CP based on pokemon. For example Machamp (average pokemon) has Max CP 2889. 80%+ will be something close to ~2800+ I had 17% IV Machamp and its max potential CP was about 2550 (dont remember clearly cause i deleted it)

          • Rohan Bhatt

            Okie. You got my attention already 🙂

          • FireWulf

            From what i have found S, SS, and SSS Ranked IVs tend to have low CPs compared to the D and C Ranked IVs at least the ones i have found in the wild. That’s why i no longer care about CP, I have tossed some maxxed CP Pokes that looks like they could have been combat worthy but there IV ended up being D and C Ranked. Nowadays i only keep SSS, SS, and S Ranked Pokemon then just collect candies and up their CP. If i have an A, B, C, or D its because thats the only one i ever caught or havent caught an S, SS, or SSS yet

          • SakShou

            not really, the question is if you want to spend your Stardust on the named Pokemon, some just dont worth spend Stardust on, Nidoran for example, and Stardust management is really important in the game. As for the question, Scizor is not actually game-deciding, im at level 33 and my Scizor with good IV has around 2500 CP (I have powered up him, lost around 100 000 Stardust and another 70 Candy (I live near a nest so I have bunch of Candy, else I wouldnt bothered)), so in your case I would say not worth it. Save your Stardust and your Buddy kms for Snorlax, Dragonite, Gyarados ,Vaporeon or Rhydon. In the end it’s up to you if you WANT to spend your Stardust on the Pokemon or not

  • XZ2017

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    …” XX% of 100%IV”… NEAR POKENAME!!^^

    … IN THE FUTURE WILL BE BETTER, … IF ALL POSSIBLE INFORMATION ABOUT ” IVs” GETS INSIDE THE POKEMON GO APP.
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    My Player Name: Luisxz2017
    Málaga, Spain.
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    THANKS FOR ALL, BIG JOHN HANKE AND EXCELLENT TEAM.!!!