you jump 1000 times
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The Pokeathlon Dome did not exist prior to Heartgold/Soulsilver, so it wasn't in Crystal.
Go to the national park and from there you should be able to the pokeathlon dome in poke mon heart gold.
You keep on doing the jump contest you can check how many times you jumped by going to the middle lady.
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.
The Pokeathlon Dome is only in Heartgold and Soulsilver. But, there are contests in Platinum. Just go to Hearthome City and go to the northernmost part of the city to reach the contest hall.