you need a Pokemon that can use HM move whirlpool
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get all the bags then
In Pokemon Gold, the Copycat Girl will give the player the rail pass when they give her a doll. The doll can be obtained from a member of the Pokemon Fan Club in Vermillion City.
first you go see copycat in saffron city and then you go to see the man in the Pokemon fane club and then you go back to copycat and then you get the magnet train pass.
here: http://www.legendarypokemon.net/pass The question was for the crystal version not the gold/silver ones. this code only works for gold and silver.
if you are talking about how to get in you have needed to have defeated Clair then pass the masters test and then you get the badge