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Screenshots of Pokésav 0.39 English, when used with Windows XP
Pokésav is a program that edits Pokémon Diamond, Pokémon Pearl, Pokémon Platinum, Pokémon HeartGold, Pokémon SoulSilver, Pokémon Black, Pokémon White, and Pokémon Black 2 save files, developed by a Japanese programmer by the name of COM. One version works with any Diamond or Pearl save file, and another works with Platinum, including those backed up from a commercial cartridge using a flashcart such as the R4 or a cheating device such as the GameShark Duo. The application can also export Action Replay DS codes; when activated, the codes will provide the same effects in-game as editing the save file.
With Pokésav, players can edit many aspects of the game including Pokémon, their movesets, the inventory, and in-game records. Because of this, many people consider it to be a "hacking" program used to gain an unfair advantage in competitive play. Creating a Pokémon of any caliber may only take a few minutes with the use of Pokésav, whereas it may take hours and hours to legitimately breed and train the same Pokémon. This brings up questions as to whether the use of the program is ethical. Despite this benefit, there is still the risk of corrupting a save file while using Pokésav. As a precaution it is strongly advised that anyone attempting to use the program back up their save file before doing so. However with the release of updated versions this has been worked on.
To combat the usage of programs like Pokésav, Nintendo has banned the use of all Pokémon they determine to be "hacked" from online play. This includes such Pokémon with impossible movesets, Abilities, or genders that they're not supposed to have such as a Spiritomb with Wonder Guard or a male Chansey. However, sometimes Nintendo's servers cannot differentiate edited Pokémon from trained Pokémon, so these legitimate-looking Pokémon are often let through.
When the early version of Pokémon HeartGold and SoulSilver's Pokésav was released, Sinnoh location names were still in the program, making it difficult to set some values. This was later fixed in the Japanese version, though the current English version (.03a) still lacks this important update. It was later discovered that HeartGold and SoulSilver do not read location in the traditional sense, and instead use a hidden hexadecimal value to read Johto/Kanto location names.
People who have translated Pokésav: English translations by various (GSD/CadaGuti/fenzo666/coolbho3k), Dutch translation by Grovyle91, French translation by fenzo666 (D/P) and GruntZ (Platinum), German translation by mountarreat. English translation for Pokésav HGSS by CloneCharizard.
A new version of Pokésav was released compatible with Black and White. This version has been fully translated into English by jsparrow. As of 31 October 2010 the latest version is 0.06c. This version does not edit Gym Badges. With the increasing use of PokeGen and Japan's internet piracy laws, there have been no new versions from COM since.