The Disappearing Bicycle glitch, or more informally the disappearing bike glitch is a natural glitch in Pokémon Omega Ruby and Alpha Sapphire.
Summary
The glitch takes place during the Delta Episode post-game quest, and involves the player's Bicycle temporarily disappearing as if they were not riding it. The player must speak to Aster (Zinnia's Whismur).After crouching and standing back up, the player character will not appear on their Bicycle, but the Bicycle will reappear after opening the menu afterwards (or fast access menus including from registered items with Y, or BuzzNav.