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The Pocket Monsters Save Data Editing Tool (Japanese: ポケットモンスター セーブデータ改造ツール) or POKESAV is a Win32 app for Windows 95 and later that edits save files of specific core Pokémon games, developed by a Japanese programmer known by the alias "COM".
It is recommended that players back up their save files before performing changes with POKESAV. If changes are made before being written to the save file, players can use POKESAV's function to undo the changes (ファイル再読み込み reload file), which restores the data in the file to the initial state.
POKESAV can also export Action Replay DS codes to perform the changes directly in-game.
There are four different editions of the app, each for use only with the games it targets.
- The Diamond and Pearl edition, which is at version 0.40d.
- The Platinum edition, which is at version 0.06e.
- The HeartGold and SoulSilver edition, which is at version 0.03a
- The Black and White edition, which is at version 0.06c.
- A PC/AT-compatible or NEC PC-9800 series machine
- The Japanese releases of Windows 98 or later (Windows 95 also supported but only with Internet Explorer 3.01 or later installed)
Because the app is not written in Unicode, it will present either question marks or mojibake to non-Japanese Windows users. To work around this, users of Windows XP may use AppLocale while users of Windows 7 and later may use Locale Emulator. Users of Windows Vista need to change the system's locale (language for non-Unicode software) to Japanese; this method may also be employed in the other versions of Microsoft Windows. Changing the system's locale will affect all apps, however.