go to new bark town and talk to Lyra/Ethan, she/he will tell you to obtain 5 of them. Come back with 5 on one Pokémon and she/he will reward you with a star for your Trainer Card and convert the 5 leaves into a leaf crown for your Pokémon.
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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
I believe you can get a Shiny Stone in HeartGold in the Pokèathlon Prize Corner after you get 5000 Points.
Yes the same way you get shiny Pokemon in the other Pokemon games is how you get shiny Pokemon in heartgold. There is a free shiny Pokemon in the lake of rage.
You can buy the Shiny stone at the pokeatholon dome
To get any Shiny Pokemon, you need: LUCK