So you want somebody to completely duplicate all the functionality in an existing app just to add two features. Yeah OK, that's a bit silly.
Instead, put in a feature request to those that develop the editor, I'm sure they'll ignore your request much better then we are though.
Anyway, I've only known about the pokemon red/blue savegame editor, all my searches for savegame editors for Silver/Gold (the only other one I've played and the last one I plan to play) came up empty, so I assumed it didn't exist.
IMO 251 is the number of pokemon. any pokemon number above that is called a "transformer".