How do you get the bike in Pokemon Diamond?
After Buck gets the Magma Stone you must go to his house in the Survival Area (the house to the left of the Pokémon Center) and talk to him and his grandfather. Buck will go put the Magma Stone back and now you can go to the room where you first found the Magma Stone and Heatran will be there ready for you to catch.
Pokemon Diamond: How do you change gears on your bike? You simply press the b button to toggle between low and high gear, to get up the slopes you will need to be in the faster gear.
Rad Rickshaw’s Cycle Shop
How do you get to Stark Mountain in Pokemon Diamond?
Generation IV – The bicycle can be obtained from the owner of the Bicycle Shop by rescuing his Pokémon from the Galactic building in Eterna City. The bicycle have two gears of different speed – normal and fast. Press the ‘B’ button to change gear. The bicycle can ride on wooden planks.
Rad Rickshaw’s Cycle Shop To find the owner, you need to access the Team Galactic Eterna Building. First, you need to get HM01 Cut and the Forest Badge in order to enter the building. After you save the bicycle owner’s Pokémon, visit the shop and he will give you a Bicycle for your effort.