in mauville city your choices are a mach bike (very fast but hard to turn) acro bike (a bike that is not very fast but easy to turn and you can do stunts with it)
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Next to the pokemon center in Mauville
acro bike
You can get up the mud slopes using the Mach Bike at full speed in Pokemon Ruby. You can get the Mach Bike by talking to Rydel in the bike shop of Mauville City.
Get an Acro Bike and hold down B while moving.
mauville city the bike shop is on your left..veronica