if your talking about the thin white poles in safari zone and near fortree city, i can help.
first you have to go to mauville city and go to the bike shop (if you need to) and swap you mach bike for an acro. go back to the white bridges and ride you acro bike on them. it will work! just ride the bridges on your bike down them and if there are spaces simly hop using b and left or right at the same time to jump your bike to the next bridge.
hope this helps.
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The white rock in Pokemon Emerald can be found outside the space centre in Mossdeep City. This rock seems to hold much significance to the people living in the area.
acro bike
The white rock is in Mossdeep City in front of the space center.
The Mach Bike.
on the top floor in a white building