The invalid input glitch, also known as the PC numbers glitch is a glitch in Generation VI.
The glitch causes string "123456789012" to appear for a fraction of a second when choosing to disconnect from a Pokémon storage box. This will also temporarily remove the "Organize Items" button.
The glitch would reportedly appear at the GTS or for battle requests as well, with "1234567890" and "123456789" strings.
The glitch occurring on the Pokémon storage system menu