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With the latest updates (0.41.2 for Android, 1.11.2 for iOS) in Pokémon Go, they have introduced catch bonuses. The update blurb states:

Trainers can earn a catch bonus for a Pokémon type as they catch more of a specific type

It appears that if you catch a specific type of Pokémon, you are more likely to catch similar types in the future, but I'm not 100% sure. Can someone explain how this mechanic works and if there are other considerations to be taken into account?

Here are some photos of my current catch bonuses:

Full poison catch bonus Empty fighting catch bonus

  • @Vemonus I've deleted the answer for now. Once more information becomes known, I'll update and undelete. – Nzall Oct 12 '16 at 12:38
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    It'd be nice to see exact numbers for this, once someone finds out. What does "+3" actually mean, for example? Like 30% higher chance to catch that type? – mjr Oct 12 '16 at 16:58
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    @Draken, just for the record, I have been checking daily to see if any new information has popped up. Unfortunately, no one has gotten any closer to an answer than what is here. I'm assuming the Silph Road researchers are working on it but nothing has come up yet. – Vemonus Oct 24 '16 at 13:34
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As Timmy Jim stated, and as was mentioned in the question itself: capturing a specific type of Pokémon (not species) will increase your odds of capturing other Pokémon of that type. Each badge will increase your odds by a factor of 1, though it is not yet determined what this means.

  • For capturing 10 Pokémon of a given type (bronze badge): +1 bonus catch rate
  • For capturing 50 Pokémon of a given type (silver badge): +2 bonus catch rate
  • For capturing 200 Pokémon of a given type (gold badge): +3 bonus catch rate

(Source)

These bonuses will be averaged in the case of a dual-type Pokémon. For instance, if you attempt to catch a Gloom (Grass/Poison) and you have a gold Punk Girl badge (thanks to all those Weedle), but only a silver Gardener badge, you will have a bonus catch rate of +2.5, as the gold badge gives you +3 and the silver gives you +2.

The two prevailing theories as to what these numbers mean at this time are:

  1. The +1/2/3 represent an extra 10/20/30% chance to catch a Pokémon, which would be an added multiplier after the original catch rate calculation. This theory proposes that after catch mechanic calculations have been done, the Final Catch Rate (see here for an explanation of the catch mechanics) is multiplied by 1.30 (assuming a full +3 catch rate bonus).

  2. The +1/2/3 represent an added 1/2/3% increase to the base catch rate of a Pokémon. Under this theory, for hard-to-catch Pokémon such as Dragonite, a gold badge would nearly double its base catch rate (from 4% to 7%).

Though the update is very recent, here is some anecdotal evidence to show how much the bonus catch rate works in practice. Bear in mind, the overall catch rates may have been increased with this update as well, which may slightly skew the data, but the increase in catch rate is very clear.


EDIT 1:

Though this doesn't explain exactly how this ambiguous +1/2/3 modifier works, some people have reported that the badge shines occasionally with the "Gotcha!" notification once a Pokémon is captured. (See here and here).

I noticed that sometimes, when you catch a Pokémon which catch rate is modified because of the badges you have, the badges show up again and shine.

I believe this happens because the badges actually had an effect on catching that specific Pokémon - something like "look, you only caught this one because of the badges you have."

If this is an indicator that the badges have helped you capture the Pokémon (which is what many people think), it, at the very least, shows that the badges are doing something to affect your catch rate.

EDIT 2:

Yesterday, an article was posted by the Pokemon Go GamePress team that had a reasonable estimate on how the medal catch rate bonus works. The working hypothesis is that the +1, +2, and +3 bonuses act as multipliers on the catch chance for an encounter, meaning that there is an additional multiplier on the probability to catch of 1.10 for a bronze medal, 1.20 for a silver medal, or 1.30 for a gold medal.

We also have statistical evidence suggesting that the bonus provided by gold medals is 1.3; applied in a similar matter as other multipliers in the GUCT formula.

The GUCT (Grand Unified Catch Theory) can be seen below:

enter image description here

where

Multipliers=Ball∗Curve∗Berry∗Throw∗Medal

It is worth noting that this is based on 1147 data points, but 1053 of them are for the gold medal bonus. The results show that the estimated value for the +3 bonus is 1.339 +/- 0.031, but based on how the catch mechanics work, it seems to be a safe bet that the real value is strictly 1.30.

Bear in mind the following disclaimer:

This is clearly just a reasonable theory, not a statistical conclusion, but we consider it likely enough that we'll go forth with those multipliers as we continue our research in this area.

  • From reports from friends playing with the new update (I haven't gotten the update yet), it seems much harder to catch pidgeys and stuff even with max bonus catch rate. Whereas catching more rare stuff is very easy. So it is possible it is bugged atm. – Dragonrage Oct 12 '16 at 19:03
  • It would be interesting to know which of the two theories is correct, as each one would affect the methods in different ways. Also, which order do things stack in? For example, is it, throw type (Excellent, great, nice, none), then curve ball modifier, and finally catch bonus or does the calculation happen a different way? Let's see what the internet finds and hopefully we get something more concrete eventually! – Draken Oct 13 '16 at 5:44
  • @Draken, yes, I apologize my answer couldn't be more concrete. I have been constantly refreshing the silphroad Reddit page and re-searching things regarding this new feature to find information as soon as it pops up, hopefully. As soon as I am able to determine which (if either) theory is correct, I will update my answer. – Vemonus Oct 13 '16 at 5:46
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    @Vemonus Not to worry, your answer has been the best I've seen so far and has received a well deserved upvote. I'm just curious about the statistics and how it will affect future captures, here's hoping! – Draken Oct 13 '16 at 5:50
  • The Final Catch Rate is not simply multiplied by the Metal Bonus. According to the article, the Metal Bonuses are inserted into the formula just like the other multipliers. Probability = 1 - POWER(1 - 0.5 * BaseCaptureRate * CPMultiplier, BallMultiplier*CurveMultiplier*BerryMultiplier*ThrowMultiplier*Medal Multiplier). – Tester101 Oct 25 '16 at 14:46
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You are correct about capturing certain types of Pokemon will make you more likely to catch said type in the future (Niantic words it as a "better chance." Check out this blog post from Niantic. It states that:

We are adding a new feature which grants a catch bonus when you earn medals based on catching certain types of Pokémon (Kindler, Psychic, Gardener, etc.). These new bonuses will give you a better chance of capturing Pokémon with a related type. For example, as you reach a higher tier for the Kindler Medal, your bonus to catch Fire-type Pokémon such as Charmander, Vulpix and Ponyta increases.

The blog also mentions that the way you work your way up the tiers is by capturing Pokemon of the same type. If a Pokemon has multiple types, the bonus will be the average of your bonuses for those types.

This article states that before, players could earn medals for catching certain amounts of a Pokemon type. The medals had no purpose then. Now, it will be simpler for trainers to catch more desired and powerful Pokemon of whatever type of medals that they earn, making the early stages of game easier for new players.

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