when you go through the route past goldenrod city you will find national park. The door stright ahead goes to the park the door to the left of the gate goes to the pokeathlon dome =]
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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.
you can buy one at the pokeathlon dome for 2500 points
To get a shiny stone you can you to the pokeathlon dome and sometimes you can get them at the prize exchange shop for 3000 points.
At the pokeathlon dome, it's a prize. Go here: clover.top-forum.com Zygloman
On various days of the week you can buy the thunder stone using your points at the pokeathlon dome which next to national park. North of goldenrod city.