You'll get it in Pastoria City by saving the Bike salesman from Team Galactic
You Cant But The side Boulders Like This ^ You Can Hop It
you have to beat the water gym leader which is in pastoria city
there is a girl rear stark mountain who has one (its across a log thing where you use your bike)
there is 2 one in iron island(room on left when you enter one in the desert in the battle zone(down a bike slope)
get off your bike
there is no acro bike on Pokemon platinum, you press B to change gears
No.
at enterna city
You gain it in Eterna City after saving the owner of the Bike Shop in the Galactic Building.
use your bike but press b when you are on.
When its going slower derh.....................
ONLY IN GRASS AND you can't be on your BIKE
In Pokémon Platinum, you don't actually switch bike gears like in a traditional cycling game. Instead, you have two bike settings: the Acro Bike and the Mach Bike. To switch between these bikes, you need to visit a bike shop in Eterna City and choose the bike that suits your needs, with the Mach Bike allowing for faster movement and the Acro Bike enabling tricks and stunts. Gear changes refer to different bike functionalities but are not explicitly numbered like in some other games.
Because they are mean
Walk in the grass and use it. Don't ride the bike.
You need to ride up it on a bike
Probably on Cycling Road, in between Oreburgh City and Eterna City. 'bike guy' however, is not very specific.