so ihave this sentret with a shiny leaf I don't know what it does please help me.
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The Shiny Leaf (Japanese: かがやくはっぱ Shining Leaf) is an item found in Pokémon HeartGold and SoulSilver. It is a rare item that can be found by the player's walking Pokémon. When it is found by a Pokémon, it will have no apparent presence other than on that Pokémon's status screen. When a Shiny Leaf is shown to the player's friend (Lyra or Ethan), he or she will explain about them and request for the player to bring four more. When the player shows a single Pokémon with five Shiny Leaves attached to it, a star will be awarded for the Trainer Card and a certificate that can be viewed when the player speaks to their childhood friend. He or she will then craft the Shiny Leaves into a Leaf Crown, which can be seen on that Pokémon's status screen in the same spot the Shiny Leaves were. A Pokémon can find a Shiny Leaf while being in the grassy area of a route, but the specific route a certain Pokémon can find one depends on its Nature. Due to its rarity, a Pokémon is not guaranteed to find a Shiny Leaf, even when the route and Nature match. Whenever a Shiny Leaf is found, upon examination, the Pokémon will jump and have an exclamation mark above its head, do a dance swaying from right to left, then finish off with a green musical note above its head. Each Pokémon can only find one Shiny Leaf per route. It is not necessary to walk around in the tall grass to find a Shiny Leaf; merely talking to the Pokémon repeatedly will eventually procure a Shiny Leaf, as long as the Pokémon itself is in the tall grass. Despite the player's friend implying the opposite, the Pokémon's friendship has no effect on its ability to find Shiny Leaves. - Bulbapedia. look at the link.
Read this Bulbapedia Page for everything you need to know.
So basically, nothing except for giving you a certificate and something to show-off about :P __ Hope I helped :]
all it does is allow you to have bragging rights...thats it.