ERROR! appearing on the list of party screen options for a specific Pokémon
'ERROR!' is an unused option string that can be forced on an options box for the party Pokémon screen. Its purpose if anything is undocumented.
It follows on from 'MAIL' (hex:14); the last valid option. Field moves have index numbers between hex:01-0E, so "ERROR!" probably wasn't supposed to be one.
Enter the GameShark code 0115D6D0 to replace the third party menu option with "ERROR!". All ERROR! does with this code is function like cancel.
- ERROR! on TCRF's Pokémon Gold and Silver article.