Get an Acro Bike and hold down B while moving.
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u cannot do that unlike pokrmon ruby and sapphire
the only way to jump on bike is to jump of a cliff!
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.