Go to the national park and from there you should be able to the pokeathlon dome in poke mon heart gold.
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On Pokemon Soul Silver and Pokemon Heart Gold, you have to defeat the Goldenrod City Gym Leader, Whitney, and then she tells you that the construction for the Pokeathlon Dome is complete.
go to national park inside then go left and up
You could show either a Growlithe (Heart Gold) or a Vulpix (Soul Silver) to Bill's Grandfather at Route 25, or you can buy it at the Pokeathlon Dome on Tuesdays for 2500 points.
No Pokemon, in any games, hole a shiny stone. In Pokemon HeartGold you can buy a Shiny Stone at the Pokeathlon Dome, after the National Pokedex is obtained, on Sunday, Monday, Wendsday, Thursday, and Saturday for 3,000 points.
The Pokéathlon Dome is a location in Johto, west of the National Park. It is the place where Pokéathlon competitions are held.