In Eterna city. First you have to fight the gymleader at Eterna. Then teach one of your Pokemon cut. Then above the Pokemon center there's a blue building with three breakable trees. Use cut on those trees. Then go in the building. In the building fight commander Jupiter. After that you save the bicycle guy. Then get out of the building. Then go to the building of the bicycle guy which is brown in Eterna. It has bicycles by it.
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The eterna city bike shop.
The bike shop is in Eterna City.
Sorry, you can not get tepig in pokemon diamond version because diamond is a 4th generation game and tepig is a 5th generation pokemon. Get black/white!
the only way to jump on bike is to jump of a cliff!
He is in Eterna City, to the south of the Pokemon Center.