Expn Card Pokemon Heartgold. In pokemon silver after you get the expn card you will get a pokemon flute melody on the last line of your radio which you can use to awaken the sleeping snorlax blocking the way to the cave that leads to pewter city Adjust the frame settings and click on the play button.
First of all download the nintendo ds emulator and the rom file from the above direct link. Go to power plant, and talk to fat guy, go to cerulean gym and and meet team rocket, go to nugget bridge and talk to team rocket, beat him, and go to cerulean gym again and check the tube on the upper, aside from pool, go back to power plant, and talk again to the manager (fat guy). The expn card is a pokégear app that allows the player to play radio functions from around the pokémon globe.