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string path = @"E:\mysavefile.sav"; var sav = SaveUtil.GetVariantSAV(path); var all = sav.BoxData; var pathPB7 = @"E:\poke.pb7"; var dataPB7 = File.ReadAllBytes(pathPB7); var pb7 = new PB7(dataPB7); all[0] = pb7; sav.BoxData = all; File.WriteAllBytes(path, sav.Write()); Example linqpad script attached; you have to press F4 and add the DLL path, and add the using namespace.

If you only care about the TID, in PKHeX, simply hold ALT and Left Click on the star icon next to the PID. This will alter the Secret ID to be shiny without changing the Trainer ID or PID. If you want all pokemon to match the exact same Trainer ID AND Secret ID, then you will have to find new IVs/Nature/PID combinations that match your desired TID and SID combo. To do this, in Pokefinder, set up a profile with the desired Trainer ID and SID, go to Gen 4 and the correct option for the type of encounter, then Searcher, set the correct Method for your encounter, enter your desired filters and set Shiny to Star/Square, then hit Search.