The mystery gift option is already at your disposal. Unlike in Diamond and Pearl, you already have the mystery gift option. Before accessing your save file, just scroll down to the mystery gift option.
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There is no code for it because it is a wifi mystery gift that has already passed
the first mystery gift that has come out for soul silver and heart gold is the yellow forest. it is a route for your pokewalker that has only pikachu in it.
Pikachu is on route 12 in Kanto, or if you go to mystery gift you can get the yellow forest route for your pokewalker and catch him there.
Nope, the only thing the Mystery Gift does is allow you to get event Pokemon
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