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I recently came across an image dump of all shiny/non-shiny Pokémon's QR codes. Before I start scanning away, I'd like to know what benefit all these codes will get me. What does scanning the QR codes for Pokémon do?

  • Scanning a QR code reads the code as a series of lines of either binary or hexadecimal data depending on whether it is a color or non-color system of encoding QR codes. Said data is then interpreted appropriately. – The Great Duck Nov 28 '16 at 2:36
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    @TheGreatDuck that has nothing to do with Pokémon though. I was asking how it affected the game. – Vemonus Nov 28 '16 at 2:37
  • "What does scanning QR codes do?". I know programming. It felt wrong for me to not at least try to answer the question in the way I read it from the ad on the stack exchange site and give a little information for you. :p – The Great Duck Nov 28 '16 at 3:24
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A couple of things:

1) It adds them to your Pokédex as "Seen" Pokémon, so you can check the map for their catch locations (and I think activates the "This move will be Super effective" / "Effective" / "Not very effective" message in the battle screen?)

2) After scanning ten codes, you can activate the "Island Scan" feature, which spawns a rare (in Alola) Pokémon somewhere on the island you are currently on for 60 minutes.

You can scan ten codes a day, after which it slowly recharges over time.

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    The last I read was that the scans regenerate at a rate of 1 every 2 hours. – SGR Nov 28 '16 at 11:51
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    It also adds the specific sprite to your Pokedex. So even if you have already caught some Pokemon and scan the QR code for a different sprite (shiny, different Forme, gender differences), that sprite will be added to its Pokedex entry. – scenia Nov 28 '16 at 16:41
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Scanning a Pokémon's QR code will register you as having seen it, in your Pokédex.

As an added benefit registering 10 Pokémon, even if you have seen them before enables you to perform an Island Scan for rare Pokémon. These Pokémon vary by day of the week and by island, for a total of 28 different Pokémon. They are not otherwise obtainable in game. The scanned Pokémon will appear at a random location on your current island, and you will only get a single encounter with it.

You can scan an additional Pokémon every 2 hours, and store up to 10 scans in total.

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Additionally to the above answers, there are also special event QR codes that can award event Pokémon.

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