The Ghost Bicycle glitch (also known as Ghost Bike glitch) is a glitch in Pokémon Red, Blue, and Yellow.
In Pokémon Red, Blue, and Yellow, if you save the game in the Cycling Road then reset and start a new game without clearing the save file with Up+Select+B, the memory address D732 (D731 in Yellow) will still have bit 5 set on the new game. Even though the entire WRAM is cleared when selecting "new game", address D732 is specifically being preserved, presumably because it also contains a debugging flag that will speed up the pregame procedure.
This means if you continue using this save file until you exchange the Bike Voucher for a Bicycle, the game will state that the player "can't get off here." when trying to use the Bicycle even though the player isn't on the Bicycle.
This glitch also prevents Surfing with a Pokémon (but not via the ?????, hex 07 item) when the player gets to use it provided that the glitch isn't fixed with one of the methods below.
Fixing the glitch
The glitch can be fixed by performing one of the following actions:
- Using Dig.
- Using Teleport.
- Using Fly.
- Using an Escape Rope.
- Going in and out the Cycling Road.
- Blacking out (both in battle and in overworld).
- VAAMusicalMike and gnsquared for sharing the glitch.
- theflyingpen on Supercheats for bringing up the problem.
- TheZZAZZGlitch for details on why the glitch occurs and how to fix it.