Go to the bike store in Mauvile city
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The Mach Bike.
First download Visual Boy Advance for mac,( it will let you play the game) then type in Pokemon Emerald Rom in google, and download it from coolrom.com
You Can Aquire Either An Acro Bike Or A Mach Bike In Mauville City At Rydel's Bike Shop.
In mauville city