First you have to go to Goldenrod City. Go up to where the gym is and keep heading right. Go down and walk between the houses and you'll come to one that you can go inside. Head in and it's a bike shop. The owner says he hasn't been getting business and asks you advertise by riding one of his bikes around, say yes and it's yours. Open your bag and hit right on the d-pad until you get to Key Items. scroll down and select the bike and use it. You can also register it so when you hit Select it automatically uses the bike.
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On the east side of GoldenRod City in a little house.
AnswerUnfortunately, the running feature was intoduced in Pokemon Ruby and Sapphire - the generation after Pokemon Crystal. This means that the fastest way of moving around in Crystal is by riding a bicycle, with the only other option of movement being walking.
AnswerIf you use Headbutt on a tree in Pokemon Crystal, one of the following Pokemon may appear: SpearowHeracrossAipomEkansHoothootNoctowlSpinarakPinecoLedybaExeggcuteVenonatCaterpieMetapodButterfreeWeedleKakunaBeedrill
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In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.