you will need gba games of Pokemon old version and get six Pokemon to migrate it in the pal park
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It is in the National Park above Goldenrod City.
Go to the national park and from there you should be able to the pokeathlon dome in poke mon heart gold.
I think you can with action replay or pal park. But the rest is trading
The Pokéathlon Dome is a location in Johto, west of the National Park. It is the place where Pokéathlon competitions are held.
You can get it in Johto by coming 1st in the National Park's Bug catching competition, You can also get it by winning events in the Pokeathlon Dome In Kanto, one way to get it is to show Bill a Marril In Heart Gold, or show him a Staryu in Soul Silver Or you could just wait for the Girl on Route 42 to ring you (if you have her number) she gives you items, mainly evolution stones.