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Old 4 Weeks Ago (6:53 AM). Edited 4 Weeks Ago by Orithan.
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Orithan Orithan is offline
     
    Join Date: Jan 2015
    Gender: Male
    Posts: 54

    A perfect IV Machop caught in the wild. Screenshot taken with Pokegenie.

    What are IVs:
    Each Pokemon in Pokemon Go have three stats; Attack, Defense and Stamina, which are used to determine their Combat Power (CP). These vary a bit between each Pokemon of the same species, due to Individual Values (or IVs for short) which are rolled randomly to ensure no two Pokemon completely alike. Each stat can have an IV of between 0 and 15, with 0 being the lowest and 15 being the highest. Naturally, finding Pokemon with high IVs is important because they will have better overall stats than one with low IVs, but depending on your time and resources this may not always be viable.
    A Pokemon with IVs of 15 rolled in every stat is said to have perfect IVs while a Pokemon with 0 rolled in every stat is said to have the worst possible IVs. This makes a significant difference in the Pokemon's CP and emphasizes on the search for high IVs. If you capture lots of Pokemon, I would suggest keeping only high IV Pokemon and transferring all others because it reduces the clutter in your Pokemon storage - Your storage will quickly fill up otherwise.


    How do IVs work:
    Each IV on a Pokemon is randomly rolled; evenly from 0 to 15 in most cases. This results in a total of 163, or 4096, possible IV combinations. This makes searching for high IV Pokemon tedious and makes monsters like the 100% IV wild Machop I pictured especially rare.
    Here is the break down of the various categories of IV spreads and their appearance rate for regular wild encounters:
    Code:
    Normal wild Pokemon. Full range of IVs are rolled.
    +------------+---------------+-------+-------+---------+---------+
    | % IV       | Quality       | Freq. | Cum.  | % Freq. | Cum.    |
    |            |               |       | Freq. |         | % Freq. |
    +------------+---------------+-------+-------+---------+---------+
    | 0% IV:     | Worst         |     1 |     1 |   0.024 |   0.024 |
    | 1-15% IV:  | Terrible      |   119 |   120 |   2.907 |   2.930 |
    | 15-30% IV: | Bad           |   440 |   560 |  10.742 |  13.672 |
    | 31-50% IV: | Adequate      |  1488 |  2048 |  36.328 |  50.000 |
    | 51-60% IV: | Above Average |   920 |  2968 |  22.461 |  72.461 |
    | 61-80% IV: | Good          |   908 |  3876 |  22.168 |  94.721 |
    | 81-90% IV: | Great         |   185 |  4061 |   4.517 |  99.146 |
    | 91-99% IV: | Excellent     |    34 |  4095 |   0.830 |  99.976 |
    | 100% IV:   | Perfect       |     1 |  4096 |   0.024 | 100.000 |
    +------------+---------------+-------+-------+---------+---------+
    Freq.: Frequency. Number of combinations which fall into this range.
    Cum. Freq.: Cumulative Frequency. Total number of combinations from before this point are added up to this.
    % Freq.: Percentage Frequency. Percentage of combinations which fall into this range.
    Cum. % Freq.: Cumulative Percentage Frequency. Total percentages of combinations from before this point are added up to this.

    As you can see here, the chance of getting high IVs are relatively low, with only a 5.279% chance of rolling a Pokemon with an IV score of over 80% if they were caught in the wild under normal conditions. This gets even more narrower if you want more than 90% IVs like I do, at a bleak 0.854% chance of obtaining those IVs per roll.

    However, there are conditions that tweak the IV rolling system, enforcing a higher roll floor than 0 and thus raising the likelihood of getting high IV Pokemon.
    During weather events, wild Pokemon with the types corresponding to the weather appear more often and are higher-levelled. This also influences the IV rolls, causing the game to roll IVs between 5 and 15 for each stat on wild Pokemon spawned during their respective weather.
    Code:
    Weather-boosed Wild Pokemon. IVs 5-15 are rolled per stat.
    +------------+---------------+-------+-------+---------+---------+
    | % IV       | Quality       | Freq. | Cum.  | % Freq. | Cum.    |
    |            |               |       | Freq. |         | % Freq. |
    +------------+---------------+-------+-------+---------+---------+
    | 0% IV:     | Worst         |     0 |     0 |   0.000 |   0.000 |
    | 1-15% IV:  | Terrible      |     0 |     0 |   0.000 |   0.000 |
    | 15-30% IV: | Bad           |     0 |     0 |   0.000 |   0.000 |
    | 31-50% IV: | Adequate      |   120 |   120 |   9.016 |   9.016 |
    | 51-60% IV: | Above Average |   323 |   443 |  24.468 |  33.283 |
    | 61-80% IV: | Good          |   668 |  1111 |  50.182 |  83.471 |
    | 81-90% IV: | Great         |   185 |  1296 |  13.899 |  97.370 |
    | 91-99% IV: | Excellent     |    34 |  1330 |   2.555 |  99.925 |
    | 100% IV:   | Perfect       |     1 |  1331 |   0.075 | 100.000 |
    +------------+---------------+-------+-------+---------+---------+
    | Note: The minimum possible IV score for wild Pokemon receiving |
    |       weather bonuses is 15, or 33% IV score                   |
    +----------------------------------------------------------------+
    When catching Pokemon in their boosted weather, there is a 220/1331 (or 16.529%) chance they will have over 80% IV score and a 35/1331 (or 2.63%) chance of rolling over 90% IV score. Much better odds!

    Pokemon obtained by hatching, defeating raid bosses and research rewards instead roll 10-15 per stat, resulting in much higher average IV yields.
    Code:
    Hatched Egg, Raid Boss and Research reward pokemon. IVs 10-15 are rolled per stat
    +------------+---------------+-------+-------+---------+---------+
    | % IV       | Quality       | Freq. | Cum.  | % Freq. | Cum.    |
    |            |               |       | Freq. |         | % Freq. |
    +------------+---------------+-------+-------+---------+---------+
    | 0% IV:     | Worst         |     0 |     0 |   0.000 |   0.000 |
    | 1-15% IV:  | Terrible      |     0 |     0 |   0.000 |   0.000 |
    | 15-30% IV: | Bad           |     0 |     0 |   0.000 |   0.000 |
    | 31-50% IV: | Adequate      |     0 |     0 |   0.000 |   0.000 |
    | 51-60% IV: | Above Average |     0 |     0 |   0.000 |   0.000 |
    | 61-80% IV: | Good          |    56 |    56 |  25.926 |  25.926 |
    | 81-90% IV: | Great         |   125 |   181 |  57.870 |  83.796 |
    | 91-99% IV: | Excellent     |    34 |   215 |  15.741 |  99.357 |
    | 100% IV:   | Perfect       |     1 |   216 |   0.463 | 100.000 |
    +------------+---------------+-------+-------+---------+---------+
    | Note: The minimum possible IV score for a hatched Pokemon, raid|  
    |       boss and research Pokemon is 30 or 66% IV score          |
    +----------------------------------------------------------------+
    As shown, the odds increase dramatically. These Pokemon have a 160/216 (20/27 or 74.764%) chance of rolling over 80% IV score and a 35/216 (or 16.204%) of rolling over 90% IVs, making them ideal situations you want to hunt for to get high IVs but they are generally rare and difficult to get

    There is, at the time of writing, no possible way to directly manipulate the IVs you roll. The only methods of influencing your IV yield are to catch Pokemon during weather conditions where they receive bonuses in, to hatch them, catch them as part of field research or catch them as a raid boss and it is advised to acquire these Pokemon through these methods if possible.


    How to check IVs:
    Now that you know the rate of obtaining Pokemon in each bracket of IVs, you may be wondering how you can check their IVs. Well, there are two ways of doing so, of which I will briefly go into.
    The first way is to have your Pokemon appraised by your team leader. You appraise pokemon by doing the following:
    • Touch the Pokeball icon on the main screen.
    • Touch the Pokemon icon.
    • Select a Pokemon.
    • Touch the Menu button.
    • Touch Appraise.
    • Repeat the previous three steps for as many pokemon as you wish.

    Now on the appraisal screen; your team leader will tell you about the pokemon's overall potential, their best stats and how strong they are and also their size. The words they use differ depending on which team you are from but they all convey the same message. You should watch for the following messages when checking your pokemon's IVs:
    Spoiler:

    The following three quotes indicate that your pokemon has great IVs, total of 37 or higher (>= 81%):
    Quote:
    Originally Posted by Spark, Instinct
    Overall, your Pokémon looks like it can really battle with the best of them!
    Quote:
    Originally Posted by Blanche, Mystic
    Overall, your Pokémon is a wonder! What a breathtaking Pokémon!
    Quote:
    Originally Posted by Candela, Valor
    Overall, your Pokémon simply amazes me. It can accomplish anything!
    The following three quotes indicate that your pokemon have sub-par IVs, total of 22 or lower (<= 50%). Don't be afraid to transfer these pokemon unless that's the best specimen you have.
    Quote:
    Originally Posted by Spark, Instinct
    Overall, your Pokémon has room for improvement as far as battling goes.
    Quote:
    Originally Posted by Blanche, Mystic
    Overall, your Pokémon is not likely to make much headway in battle.
    Quote:
    Originally Posted by Candela, Valor
    Overall, your Pokémon may not be great in battle, but I still like it!
    The following three quotes indicate that your pokemon have maximum IVs (15) in your pokemon's highest stats:
    Quote:
    Originally Posted by Spark, Instinct
    Its stats are the best I've ever seen! No doubt about it!
    Quote:
    Originally Posted by Blanche, Mystic
    Its stats exceed my calculations. It's incredible!
    Quote:
    Originally Posted by Candela, Valor
    I'm blown away by its stats. WOW!

    More details can be found here. Most of the information about appraisal mentioned here comes from this page.

    The second method, which gives a more accurate reading, is to download an app or program which calculates the IVs of a pokemon and follow the instructions given by the program. I use Pokegenie for this, which is available on the Google Play Store and can be downloaded for free. As always, exercise caution when downloading apps.

    Sources:
    https://pokemongo.fandom.com/wiki/Pok%C3%A9mon_Appraisal (Pokemon Go Wiki)
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