How do you obtain Bottle Caps?
Pokémon Sun & Moon introduced a new mechanic called Hyper Training that lets Pokémon behave as if their IVs were maxed even if they're not, but it requires items called Bottle Caps. How are these items obtained?
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Hyper Training is found in the Hau'oli City Shopping Mall. Here, you can visit this shop and speak to Mr. Hyper and exchange Bottle Caps, in order to increase the IVs of your Pokémon. This can only be done if your Pokémon has reached Level 100.
There are two different kinds of Bottle Caps. The standard Bottle Cap will raise one IV to the maximum, and the Gold Bottle Cap will boost all six IVs to maximum. These items are quite rare, and can be more predominantly found through exchanging Shards for them in the Festival Plaza and through the Lottery Shops there.
The thing with Hyper Training is that the boost is superficial. The actual IVs of the Pokémon do not get increased, merely they give the appearance of having maximum. Due to this, the Pokémon's Hidden Power will remain the same as it always was, and the Pokémon, when bred, will not pass any maximum IVs as the Pokémon's IVs are still how they were originally. It factors in battle, but the IV does remain unchanged for all other purposes.
EDIT: Everyone who buys the game will be able to "redeem" a free Magearna and will be holding a Bottle Cap. Source
More about redeeming the Magearna here
EDIT 2: As pointed out by Kai and PartHunter bottle caps can be obtained(very rarely) while fishing. You can also get bottle caps as a reward once you attain a win streak of 30 in the Battle Tree.
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How do you get Bottle Caps?
Bottle Caps can be obtained through a number of different methods:How can I get Bottle Caps fast?
How to get Bottle CapsWhat raids drop Bottle Caps?
Here are all the locations you can find Bottle Caps throughout the massive region of Galar.How do you get Bottle Caps in brilliant diamond?
Bottle Caps can be purchased for 25 BP. This can only be done after you have obtained the National Pokedex in Brilliant Diamond and Shining Pearl. To do that, you need to have beaten the Champion and entered the Hall of Fame. Then, you must have all 150 Sinnoh Pokemon seen and completed the regional Pokedex.[Pokemon The Isle of Armor] How to Get Bottle Caps and Gold Bottle Caps EASILY
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