It's just a decoration for your Pokemon, which can be found by walking in a grass patch for a long time (make sure to have repell on). Sooner or later they will be holding something. Talk to them and they will give it to you (it's rare for this to happen).
If you happen to get five with the same Pokemon, Lyra/Ethan will turn it into a leaf crown for your Pokemon to wear and add a star to your Trainer Card.
you can find a leaf stone in viridian forest in kanto in heartgold
there is no Pokemon green leaf and Pokemon leaf green you can't only diamond pearl platinum heartgold soulsilver and maybe black and white
You can get an Abra at the gamecorner in golden rod and evolve it.
i think it is a leaf stone
It is your rival from Pokemon fire red and leaf green versions.
There is no way to get a golden Ditto in Pokemon HeartGold because it doesn't exist in the video games only a regular Ditto exists as well as a blue Ditto exists and a blue Ditto is known as a Shiny Pokemon.
I believe it is something like a shiny Pokemon or shiny leaf stone. Getting a shiny Pokemon takes LOTS of luck, and a shiny leaf stone I think you find in patches of grass outside of Violet City in HeartGold. Hope this answers your question
collect five on one pokemon then take them to eathan/lyra and they turn it into an accessory (a leaf crown)
go in the golden rod under ground tunnel
At the Flower Shop in Golden Rod City.
you can get one in viridian forest that's all I know.
It will only evolve through the use of a leaf stone.