A Save Editor for Pokemon Stadium 2
Currently can edit registered Pokemon Sets for Little Cup, Poke Cup, Prime Cup, Free Battle, and Gym Leader Castle (Johto)
Open the save file
Select the desired cup by clicking on the corresponding icons
Right click a Pokemon slot in the Registed Set list
Select "Open" to view and edit their data in the Pokemon Editor
Make your changes with the Pokemon Editor
Right click a pokemon slot again
Select "Set" to set the current pokemon to the selected slot
Use "File"->"Save"/"Save As" to export the save file