Save data

A game's save data is data that re-appears after the game is powered off and back on again, such as SRAM data on a Game Boy cartridge. The entire save data is referred to as a save file, including in the Generation II handheld Pokémon games themselves, and emulators may create a save file to store on something such as a computer's hard drive.

Usually, if the save file is deleted, all of the player's progress on the game will be lost. This can occasionally happen with glitches, though not as often as some say (for instance, the Old Man Trick can not erase a save file). A save file can also occasionally be wiped while using codes from a cheating device.

When a save file has been damaged in a certain way, the game may claim that "The file data is destroyed!" (Generation I handheld games) or "The save file is corrupted!" (Generation II handheld games).

In these cases, in Generation I, the message appears before the New Game/Option screen and the Continue option does not appear. In Generation II, the Continue option may still be present, but selecting it causes the previously mentioned message to appear, and the game will refuse to load it.

Alternatively, when a save file has been damaged a message informing the player about it may not even appear, and the Continue option will be removed. This can happen after saving the game when there is no hex:50 terminator on the player's 11th name character or less. This is possible through the ZZAZZ glitch when the hex:50 characters are not at a 'multiple of 3' letter (i.e. 3rd, 6th, 9th and 11th characters).

Internal battery problem

Save file corruption or deletion will eventually happen in a Generation II handheld Pokémon game. The internal battery is used up for the internal clock data as well as progress save data, and the internal clock keeps running even when the game is powered off. This drains on the battery.

Pokémon games from Generation III and onward such as Pokémon Diamond and Pearl save a backup save file; so if the player's current save file has been corrupted the game will try to load the last valid game save.

The player's main save data is no longer stored in a battery in Generation III games, and rather flash memory.^{[citation needed]}

Hall of Fame partial save

Certain glitch Pokémon's sprites will corrupt existing Hall of Fame data when they are sent out or seen on the opponent's side, with the most well known being Missingno. and 'M (00). This is actually a partial save, but the player's main progress data is unchanged, so if the player resets the game after encountering a Missingno. their Hall of Fame data will be corrupted even if they do not save the game from the 'start menu'.

Not all glitch Pokémon do this, for example, the glitch Pokémon PkMn (F7) in Yellow, probably because it uses Bulbasaur sprite on both the opposing side and the user's side.

See also

• Savestate
• Battery save