You can get a bike for free at the bike shop right of the PokeCentre in Mauville City, above Slateport city. There are two types of bikes, they are Mach and Acro. Mach goes really fast and the Acro goes slower but can do bunny hops. If you feel you have chosen the wrong one, you can go back and swap.
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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