You go to your bag by pressing backspace or enter ( I forgot ) then that's your bag you can go to key items and you can register it and then press enter or backspace and you can use your bike but you can't use your bike in most buildings this is only for visual boy advance
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The Mach Bike.
Do you use Visualboy Advance? Make sure this emulator is up-to-date.
Put this into a file saved as Pokemon emerald.cht and transfer it using SSH (use Fugu if you have a Mac) to the emulator. PAR_v3 "Rare Candy" 280ea266 88a62e5c
use your mach bike
Where there are little rocks going up ledges you use the acro bike. Press b and hold to start hopping on the bike the go up the rocks.