First, you challenge the gym leader then cut down the trees in front of a tall building (in platinum, a building a sphere on top).
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You have to go to Eterna City and beat team galactic who are in the building at the top of Eterna City (you will need the move cut) then when you have beaten team galactic go to the bike shop which is just down from the Pokemon centre in Eterna city and th e shops owner will give you a bike as a reward for rescuing him.
hes in the team galactic building and u have to rescue hin
you can find it in Eterna city on the top level of Team Galactic Building
In Team Galactic building in Eterna City, in the chamber to the right after you've found the bicycle guy with Jupiter.
you have to beat team galactic in a double battle with luke/dawn and a guy will come up to you and tell you the building is now open