The pokeathlons are held in the pokeathlon dome. The pokeathlon dome is on Pokemon heartgold and soulsilver only, at the national park.
For Pokemon diamond ,pearl and platinum only, there is the contest hall in Hearthome city, where they hold Pokemon contests, where winners are awarded with a ribbon (normal rank), balloon (super rank), accessories (ultra rank) and I'm not sure about master rank. The colour or type of rank prize, differs depending on which category of contest you won under (smart=green;tough=yellow;cute=pink;beuty=blue;cool=red).A pokeathlon's prize is a badge, that has the design of pokeathlon course you won under, (speed, jump, power,skill, or stamina).
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On some days of the week you can go to the pokeathon dome place in the johto region and buy on there
you can get the fire stone at the pokeathon dome (near the national park) as a prize on certain days
Shiny Stones are only available at Pokeathon Mondays,Wednesdays, Thursdays, Saturdays, and Sundays after you have obtained the National Dex.
I traded one to my game. They are common is Pokemon Diamond and Pearl, so if you get one there you can trade it to your Soul Silver. If you don't have one of these versions, you can get a Shiny Stone in the Pokeathon Dome from 3,000 BP.