PKHeX

Pokemon core series save editor, programmed in C#.

Supports the following files:

Save files ("main", *.sav, *.dsv, *.dat, *.gci)
GameCube Memory Card files (.raw, .bin) containing GC Pokemon savegames.
Individual Pokemon entity files (.pk*)
Mystery Gift files (.pgt, .pcd, .pgf, .wc*) including conversion to .pk*
Importing teams from Decrypted 3DS Battle Videos
Transferring from one generation to another, converting formats along the way.

Data is displayed in a view which can be edited and saved. The interface can be translated with resource/external text files so that different languages can be supported.

Pokemon Showdown sets and QR codes can be imported/exported to assist in sharing.

Nintendo 3DS savedata containers use an AES MAC that cannot be emulated without the 3DS's keys, thus a resigning service is required (svdt, save_manager, JKSM, or SaveDataFiler).

We do not support or condone cheating at the expense of others. Do not use significantly hacked Pokemon in battle or in trades with those who are unaware hacked Pokemon are in use.