you get out of the park and continue your game
To the left of the National Park!
buy it with 2550 points in the athlete shop in the pokéathlon dome.
You get it in the cave going to Cerulean City. You will have to fight a guy, and then he tells you he will share. However, you may only choose one.
SOulsilver
Pokeatlon Dome is place where you can compete in competitions. You compete with your Pokemon and control them with stylus. In every competion you win points and you'll be able to buy some stuff with them from the Pokeathlon Shop that's also inside the building (including potions, rare candy, evolution stones) The prizes that you can buy change daily, so you'll need to check back every day if you are looking for a specific item.
at the pokeatlon dome by prices
yes you can
buy it at the pokeathelon dome
To the left of the National Park!
Figure it out
have the dome fossil restored at the pewter museum of science
Ruins of Alph by using Rock Smash on the Rock Smash-able rocks. I believe the Dome Fossil is only found in Soulsilver, I could be wrong.
you can buy one in the pokeathon dome for 3000 points.
Athletes Shop in the Pokeatholon Dome on certain days
it is near golden road you go stright and turn left
Wear is pokeatlon in platinum?
You could find buy them on Tuesdays at the Pokeathlon Dome for 2500 points.