4th Gen Shiny Leaves??

[Vulpixer]

My Pokemon keep finding these shiny leaves. What are they supposed to do? What are they for?

 

[Guy]

[jq]What is the Shining Leaf? How do I get it?
The Shining Leaf is a rare item found by your Pokémon. It is not a standard item or accessory, and can only be seen through your Pokémon's status screen. You can only get the Shining Leaf by talking to your partner while in a grass area. However, finding the Shining Leaf in a certain are depends on the nature of your Pokémon and the specific locations.

What's my reward for finding a Shining Leaf?
Once you obtain one Shining Leaf, then you should go see Ethan/Lyra in New Bark Town. Here they will explain more to you about the Shining Leaf and how he/show wants you to collect five of them (on the same Pokémon). Once you've done so, he/she will reward you with a star for your Trainer Card.

If you wish to learn more on the natures and areas to find the Shining Leaf then you can visit here.[/jq]
Straight from the FAQ and Known Information sticky, which I believe pretty much answers your question, no? Please, use that thread before asking questions, and if the answer is not given there, then try out HG/SS Help Thread for questions about the remakes, thanks.

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